This is what a section of the log looks like, with levels from How to get logs?.
23:40:24:852 dev /dev/ttyS0 (/dev/ttyS0)
23:40:28:849 dev /dev/ttyS0 (/dev/ttyS0)
23:40:29:735 Daylight now: nadir, status: 100, daylight: 0, dark: 1
23:40:29:737 networkState: CC_ReconnectNetwork
23:40:29:738 start reconnect to network
23:40:30:234 UPNP error Unknown error
23:40:30:277 Serial com connected
23:40:30:358 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:30:359 device state timeout ignored in state 2
23:40:30:522 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:30:524 device state timeout ignored in state 2
23:40:30:683 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:30:684 device state timeout ignored in state 2
23:40:30:842 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:30:843 device state timeout ignored in state 2
23:40:31:002 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:31:003 device state timeout ignored in state 2
23:40:31:163 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:31:164 device state timeout ignored in state 2
23:40:31:234 UPNP error Unknown error
23:40:31:322 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:31:323 device state timeout ignored in state 2
23:40:31:483 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:31:484 device state timeout ignored in state 2
23:40:31:642 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:31:643 device state timeout ignored in state 2
23:40:31:802 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:31:803 device state timeout ignored in state 2
23:40:31:962 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:31:963 device state timeout ignored in state 2
23:40:32:122 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:32:123 device state timeout (handled)
23:40:32:124 Serial com disconnected, reason: 1
23:40:32:126 device disconnected reason: 1, device index: 0
23:40:32:202 void zmMaster::handleStateIdle(zmMaster::MasterEvent) not connected goto OFF state
23:40:32:204 device state timeout ignored in state 1
23:40:32:234 UPNP error Unknown error
23:40:32:736 wait reconnect 15 seconds
23:40:33:234 UPNP error Unknown error
23:40:33:734 wait reconnect 14 seconds
23:40:34:234 UPNP error Unknown error
23:40:34:734 failed to reconnect to network try=1
23:40:34:736 wait reconnect 13 seconds
23:40:34:851 COM: /dev/ttyAMA0 : (0x0000/0x0000)
23:40:34:854 COM: /dev/ttyS0 : (0x0000/0x0000)
23:40:34:855 dev /dev/ttyS0 (/dev/ttyS0)
23:40:34:856 GW firmware update select /dev/ttyS0 device
23:40:34:936 GW update firmware not found:
23:40:35:234 UPNP error Unknown error
23:40:35:734 wait reconnect 12 seconds
23:40:36:234 UPNP error Unknown error
23:40:36:735 wait reconnect 11 seconds
23:40:37:234 UPNP error Unknown error
23:40:37:735 wait reconnect 10 seconds
23:40:38:235 UPNP error Unknown error
23:40:38:735 wait reconnect 9 seconds
23:40:39:235 UPNP error Unknown error
23:40:39:736 Daylight now: nadir, status: 100, daylight: 0, dark: 1
23:40:39:738 No valid ethernet interface found
23:40:39:740 failed to reconnect to network try=2
23:40:39:741 wait reconnect 8 seconds
23:40:40:234 UPNP error Unknown error
23:40:40:735 wait reconnect 7 seconds
23:40:41:234 UPNP error Unknown error
23:40:41:735 wait reconnect 6 seconds
23:40:42:234 UPNP error Unknown error
23:40:42:735 wait reconnect 5 seconds
23:40:43:235 UPNP error Unknown error
23:40:43:734 wait reconnect 4 seconds
23:40:44:234 UPNP error Unknown error
23:40:44:734 failed to reconnect to network try=3
23:40:44:736 wait reconnect 3 seconds
23:40:44:856 COM: /dev/ttyAMA0 : (0x0000/0x0000)
23:40:44:858 COM: /dev/ttyS0 : (0x0000/0x0000)
23:40:44:860 dev /dev/ttyS0 (/dev/ttyS0)
23:40:44:861 GW firmware update select /dev/ttyS0 device
23:40:44:886 GW update firmware not found:
23:40:45:234 UPNP error Unknown error
23:40:45:734 wait reconnect 2 seconds
23:40:46:234 UPNP error Unknown error
23:40:46:735 wait reconnect 1 seconds
23:40:46:846 COM: /dev/ttyAMA0 : (0x0000/0x0000)
23:40:46:848 COM: /dev/ttyS0 : (0x0000/0x0000)
23:40:46:850 dev /dev/ttyS0 (/dev/ttyS0)
23:40:46:852 auto connect com /dev/ttyS0
23:40:47:235 UPNP error Unknown error
23:40:48:234 UPNP error Unknown error
23:40:48:277 Serial com connected
23:40:48:366 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:48:367 device state timeout ignored in state 2
23:40:48:530 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:48:532 device state timeout ignored in state 2
23:40:48:690 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:48:691 device state timeout ignored in state 2
23:40:48:850 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:48:852 device state timeout ignored in state 2
23:40:49:010 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:49:012 device state timeout ignored in state 2
23:40:49:170 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:49:172 device state timeout ignored in state 2
23:40:49:235 UPNP error Unknown error
23:40:49:331 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:49:333 device state timeout ignored in state 2
23:40:49:490 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:49:492 device state timeout ignored in state 2
23:40:49:650 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:49:652 device state timeout ignored in state 2
23:40:49:737 Daylight now: nadir, status: 100, daylight: 0, dark: 1
23:40:49:739 No valid ethernet interface found
23:40:49:740 try to reconnect to network try=4
23:40:49:811 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:49:812 device state timeout ignored in state 2
23:40:49:970 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:49:972 device state timeout ignored in state 2
23:40:50:130 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:40:50:131 device state timeout (handled)
23:40:50:132 MASTER kill cmd 0x08 (ERROR)
23:40:50:133 Serial com disconnected, reason: 1
23:40:50:136 device disconnected reason: 1, device index: 0
23:40:50:210 void zmMaster::handleStateIdle(zmMaster::MasterEvent) not connected goto OFF state
23:40:50:212 device state timeout ignored in state 1
23:40:50:234 UPNP error Unknown error
23:40:50:735 wait reconnect 15 seconds
23:40:51:234 UPNP error Unknown error
23:40:51:734 wait reconnect 14 seconds
23:40:52:234 UPNP error Unknown error
23:40:52:735 wait reconnect 13 seconds
23:40:53:234 UPNP error Unknown error
23:40:53:734 wait reconnect 12 seconds
23:40:54:234 UPNP error Unknown error
23:40:54:734 failed to reconnect to network try=5
23:40:54:736 wait reconnect 11 seconds
23:40:54:866 COM: /dev/ttyAMA0 : (0x0000/0x0000)
23:40:54:868 COM: /dev/ttyS0 : (0x0000/0x0000)
23:40:54:869 dev /dev/ttyS0 (/dev/ttyS0)
23:40:54:871 GW firmware update select /dev/ttyS0 device
23:40:54:898 GW update firmware not found:
23:40:55:234 UPNP error Unknown error
23:40:55:734 wait reconnect 10 seconds
23:40:56:234 UPNP error Unknown error
23:40:56:735 wait reconnect 9 seconds
23:40:57:235 UPNP error Unknown error
23:40:57:735 wait reconnect 8 seconds
23:40:58:235 UPNP error Unknown error
23:40:58:735 wait reconnect 7 seconds
23:40:59:237 UPNP error Unknown error
23:40:59:734 Daylight now: nadir, status: 100, daylight: 0, dark: 1
23:40:59:736 No valid ethernet interface found
23:40:59:738 failed to reconnect to network try=6
23:40:59:739 wait reconnect 6 seconds
23:41:00:235 UPNP error Unknown error
23:41:00:734 wait reconnect 5 seconds
23:41:01:234 UPNP error Unknown error
23:41:01:438 void MainWindow::devConnectClicked() choose com /dev/ttyS0
23:41:01:734 wait reconnect 4 seconds
23:41:02:234 UPNP error Unknown error
23:41:02:736 wait reconnect 3 seconds
23:41:02:864 Serial com connected
23:41:02:955 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:41:02:957 device state timeout ignored in state 2
23:41:03:115 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:41:03:116 device state timeout ignored in state 2
23:41:03:234 UPNP error Unknown error
23:41:03:274 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:41:03:276 device state timeout ignored in state 2
23:41:03:434 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:41:03:436 device state timeout ignored in state 2
23:41:03:594 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:41:03:596 device state timeout ignored in state 2
23:41:03:734 wait reconnect 2 seconds
23:41:03:755 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:41:03:757 device state timeout ignored in state 2
23:41:03:914 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:41:03:915 device state timeout ignored in state 2
23:41:04:074 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:41:04:076 device state timeout ignored in state 2
23:41:04:235 UPNP error Unknown error
23:41:04:236 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:41:04:237 device state timeout ignored in state 2
23:41:04:394 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:41:04:396 device state timeout ignored in state 2
23:41:04:554 void zmMaster::handleStateStatus(zmMaster::MasterEvent) EVENT_TIMEOUT
23:41:04:556 device state timeout (handled)
23:41:04:557 Serial com disconnected, reason: 1
23:41:04:560 device disconnected reason: 1, device index: 1
23:41:04:639 void zmMaster::handleStateIdle(zmMaster::MasterEvent) not connected goto OFF state
23:41:04:641 device state timeout ignored in state 1
23:41:04:734 failed to reconnect to network try=7
23:41:04:735 wait reconnect 15 seconds
23:41:04:860 COM: /dev/ttyAMA0 : (0x0000/0x0000)
23:41:04:863 COM: /dev/ttyS0 : (0x0000/0x0000)
23:41:04:864 dev /dev/ttyS0 (/dev/ttyS0)
23:41:04:866 GW firmware update select /dev/ttyS0 device
23:41:04:890 GW update firmware not found:
23:41:05:235 UPNP error Unknown error
23:41:05:734 wait reconnect 14 seconds
23:41:06:235 UPNP error Unknown error
23:41:06:734 wait reconnect 13 seconds
23:41:07:235 UPNP error Unknown error
23:41:07:734 wait reconnect 12 seconds
23:41:08:235 UPNP error Unknown error
23:41:08:734 wait reconnect 11 seconds
23:41:09:234 UPNP error Unknown error
23:41:09:735 DB save zll database items 0x00000080
23:41:09:737 DB sql exec REPLACE INTO sensors (sid, name, type, modelid, manufacturername, uniqueid, swversion, state, config, fingerprint, deletedState, mode, lastseen, lastannounced) VALUES ('1', 'Daylight', 'Daylight', 'PHDL00', 'Philips', '00:00:00:00:00:00:00:00-01', '1.0', '{"dark":true,"daylight":false,"lastupdated":"2022-01-24T23:40:09.423","status":100,"sunrise":"2022-01-25T07:19:19","sunset":"2022-01-25T15:31:05"}', '{"configured":true,"lat":"55.7123","long":"12.0564","on":true,"sunriseoffset":30,"sunsetoffset":-30}', '', 'normal', '1', '', '')
23:41:09:790 DB saved in 54 ms
23:41:09:792 Daylight now: nadir, status: 100, daylight: 0, dark: 1
23:41:09:795 No valid ethernet interface found
23:41:09:796 failed to reconnect to network try=8
23:41:09:798 wait reconnect 10 seconds
23:41:10:234 UPNP error Unknown error
23:41:10:734 Skip idle timer callback, too early: elapsed 936 msec
23:41:10:736 wait reconnect 9 seconds
23:41:11:234 UPNP error Unknown error
23:41:11:743 wait reconnect 8 seconds