This behavior has been documented all the way back in 2017.
That was still when the DTH drivers were used, it’s not a driver issue, it’s just a brand that doesn’t make quality devices. They’ll work for a while and then just present as offline in the app. I’ll bet if you cycle power to the switch from your circuit breaker, it will come back online, for a while. Sometimes I could get a few days, before I replaced them it was more like hours.
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