All my collectors are going down every 24 hours.

It is normal for the collector to restart itself every 24 hours. I also think it cycles its encryption key with the portal at the same time. But it should just take seconds for that to happen, not enough to cause any gaps or alerts. So having it take 5-10m to finish the restart is very odd, I've never seen any do that before.

I would suggest reviewing the agent logs on the collector from before Thursday and after, during the period when it normally restarts itself, to see if something changed. Worth checking Event/system logs for that period to see if the OS is seeing problems restarting the service. I would also try manually restarting the LogicMonitor service and see if even doing it by hand takes it minutes to come back up. I would also check if there is something else that might be running at the same time as the 24hr restart. Like you mentioned the collector restarts itself after ~24hours from when it was first started, perhaps it has started shifting into a period of high cpu load? or perhaps a backup snapshot pauses the VM right at that moment? etc.