Not sure if it could be related, but I am experiencing delays and lag. In vnc the debug log ouput just freezes for 5-10s and none of the devices respond during that time. Also selecting anything in the deconz window or dragging the log window do not work. I see nothing obviously wrong in the log (no errors), just missing logging during that 5s. And probably also some reporting events just go missing, explaining missed motion detection. Even went back to deconz 2.17.1, same issue.
BTW: I also had this lag a few months ago, but after changing the docker from bridged to mcvlan network that seemed to be solved until it popped up again recently.
I have been troubleshooting on and off for the last 2 days, because I also had some wifi interference issues at the same time. 
[Update] Went back to the Pi4 for now, using the same restored DB and no issues any more.
One difference I noticed is that on the Pi4 there is almost exclusively expected “ZCL attribute report…” while on the docker I saw a lot of “Skip idle timer callback, too early: elapsed 660 msec” (I see almost none of these on the Pi4)?