I’ve been meaning to report for a while but didn’t take the time, sorry.
Yet, I’m not sure it’s going to be very helpful for anywone as it was super specific to my case: my SSD enclosure was faulty, creating errors accumulating, creating lag and corruption on the pi. Too much for the Zigbee network which was going down.
I’m lucky I noticed the led blinking a bit weakly on the enclosure while doing my third re-install of HA, otherwise, I could have searched forever …
Since I changed the enclosure, not even one crash.
What also helped before and after that issue was:
- moving the Zigbee dongle to a powered USB (2) Hub (even with genuine pi power supply, it’s not enough for the Zzh for example)
- increasing the swap file. I have a Pi 3B and HA has become a bit too much for 1go of Ram. This [(How to increase the swap file size on Home Assistant OS)] is super easy and work perfectly. It solved all of the other issue I had on the PI.
Hope this helps someone one day!
And thanks to all who took the time to answer 