Trunk not registerring

PBX version 15.0.16.60 (didn't let me choose)

Hello,

from time to time FreePBX stops registering to trunks for no apparent reason. Seems to be connected to module updates being available since only times I see issues is when at least one module update is available. This is strange since updates might be available but until installed the updates shouldn't do a thing... anyway, I am unable to find any lead as to what is happening as Asterisk seems to be running correctly even though it stops registering to trunks... (all 3 that are configured). The only solution that is working for now is reboot when this happens. Biggest problem is, that there are no possible notifications for when a trunk is down since Asterisk has no knowledge about the trunk being down (which I don't understand how is possible but it is happening...)

Please, help me.

br, Jarda