Sonoff Basic gets disconnected all the time

I got a Sonoff Basic with ESPhome running for my xmas lights. So used just for two weeks in the year. Has been working fine for the last years.

This year it get disconnected and therefore unresponsive every now and then. It also switches off randomly. Can’t see any patterns.

I already replaced the sonoff with a brand new unit and it behaves exactly the same. Any idea how to track that down?

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I have exactly the same issue with all of them. Did you get any progress on this topic Since January 1st ?

Thx