Many devices offline Conbee III

We have suddenly (from one day to the other) many devices which are not connected anymore (offline).

In the deCONZ container we see logs like this:

deconz  | 08:38:45:794 0xBC33ACFFFE6BE4AF error APSDE-DATA.confirm: 0xA7 on task
deconz  | 08:38:45:795 max transmit errors for node 0xBC33ACFFFE6BE4AF, last seen by neighbors 59638 s
deconz  | 08:38:47:122 Device reset watchdog 7200 s
deconz  | 08:38:47:427 0xBC33ACFFFE6BE4AF error APSDE-DATA.confirm: 0xA7 on task
deconz  | 08:38:47:427 max transmit errors for node 0xBC33ACFFFE6BE4AF, last seen by neighbors 59640 s
deconz  | 08:38:49:341 max transmit errors for node 0x0015BC003100DC80, last seen by neighbors 1467 s
deconz  | 08:38:49:570 discovery for zombie 0x001788010D1E73FE dropped, last try was 863 seconds ago
deconz  | 08:38:53:411 discovery for zombie 0x001788010D1E723A dropped, last try was 979 seconds ago
deconz  | 08:38:57:251 discovery for zombie 0x001788010DDCDCCF dropped, last try was 441 seconds ago
deconz  | 08:39:14:098 0x00158D0000FBBE03 found group 0xFFF0
deconz  | 08:39:14:098 0x00158D0000FBBE03 found group 0x001A
deconz  | 08:39:14:098 0x00158D0000FBBE03 found group 0x0046
deconz  | 08:39:19:650 0xA4C138C96FC7C07E error APSDE-DATA.confirm: 0xA7 on task
deconz  | 08:39:25:602 max transmit errors for node 0xBC33ACFFFE6BE4AF, last seen by neighbors 59678 s
deconz  | 08:39:41:891 discovery for zombie 0x001788010DEE100A dropped, last try was 60 seconds ago
deconz  | 08:39:45:251 discovery for zombie 0x001788010DDCE2FA dropped, last try was 48 seconds ago
deconz  | 08:39:49:091 discovery for zombie 0x001788010D1E73FE dropped, last try was 922 seconds ago
deconz  | 08:39:49:571 discovery for zombie 0x001788010D1E723A dropped, last try was 1035 seconds ago
deconz  | 08:39:52:931 discovery for zombie 0x001788010D1F736F dropped, last try was 820 seconds ago
deconz  | 08:39:53:411 discovery for zombie 0x5C0272FFFE19FB81 dropped, last try was 638 seconds ago
deconz  | 08:39:58:211 discovery for zombie 0x0017880108583DA3 dropped, last try was 674 seconds ago
deconz  | 08:40:02:051 discovery for zombie 0x0017880109D43FCB dropped, last try was 1139 seconds ago
deconz  | 08:40:02:468 ZCL attribute report 0x0017880108630D1B for cluster: 0x0406, ep: 0x02, frame control: 0x18, mfcode: 0x0000
deconz  | 08:40:05:891 discovery for zombie 0x001788010D1F736F dropped, last try was 833 seconds ago

We are using the latest firmware.

Can anybody help us?

It’s look a connection issue Zigbee Error Codes in the Log · dresden-elektronik/deconz-rest-plugin Wiki · GitHub

Not using usb 3.0 port ? No changes on your hardware ?