Same problem for me, frequent unreliable zigbee network seems to have started with an update of home assistant in summer 2023.
I use an Intel NUC with Proxmox running HA, ZHA and I have a Skyconnect stick connected via a USB extension cable.
Before summer 2023, everything worked without any issues for years.
This is becoming very frustrating, most of this winter my zigbee TRV’s constantly overheat which will have an impact on my heating bills.