The problem is:
One of my cameras is in a really outdoor place, but without waterproof plugs. If it's wet, and there is strong wind, sometimes it causes multiple signal losses (maximum one second loss, some transient, video signal comes back). After this type of event the server goes into deep freeze. No specific log lines in messages. Not happens after all signal loss, but all freeze has a signal loss before.
I'm not sure if it's a zm problem, but I think this is the best forum to find others who have seen that before.
This happened on two different servers, two different capture cards, two different version of zm (1.22.x, 1.23.3), two different kernel version. The same point was only the BT878a chip. So the problem can be in hw (irq problem), driver, or in zm's signal detection (or somewhere else

Regards,
BaZso