Blue series switches dropping off mesh

**I am seeing a trend of half of the below switches dropping off the mesh, the switch in HA grey and I have to repair half the time to switch back to HA. Not sure why this is happening, I have a very stable zigbee mesh in the house.

Total: 11 Inovelli switches** (6× VZM32-SN, 5× VZM31-SN)

  • All running ZHA via Sonoff Zigbee Dongle+ V2

  • VZM32-SN: firmware 0x01030102

  • VZM31-SN: firmware 0x01020304

  • The “greying out” in HA means entities show as unavailable — Zigbee devices lost their mesh connection