Device intermittently available and unavailable

For some days now a Ikea light that was working fine started to be available and unavailable on 2 hours periods. What do you think can cause this?

I experience the same kind of issue : 1 of my zigbee device (a Sonoff ZBMini switch) becomes intermittently available/unavailable. It’s very strange because there’s another device (Philipps motion sensor) just next to it which never looses connectivity.

I guess the 2 hours period is caused by the setting “Consider mains powered devices unavailable after…” which is set to 7200s (2 hours) by default.

I’ve no idea why this specify device is having those intermittent connectivity issues…

On my case was the router that changed the WiFi channel and create interference with ZigBee.

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Tip is to follow https://github.com/home-assistant/home-assistant.io/pull/18864 → https://github.com/home-assistant/home-assistant.io/commit/970295a277e8f01d3ee39eeeaacf453625b988d3

and

https://www.home-assistant.io/integrations/zha#best-practices-to-avoid-pairingconnection-difficulties