Hub has become unresponsive multiple times since 2.2.7.125 update

[erktrek]

This happened to me on a C-4 but probably not your issue - anyway this is what @gopher.ny posted back then...

My C4's entire Zigbee mesh died overnight (on 2.2.4)

There was a bug with zigbee "last activity" timestamp getting messed up when hub time changes during a reboot. This has been fixed a few versions back, though, please let me know if you're on the latest version and it's still happening. We also know that Zigbee radio can overheat and go offline - with any firmware version. I can take a look at a particular hub if that's what's happening.