Sonoff "unavailable"devices

Hi there
I have a weird problem. Have a room running 54 sonoff units, mostly the BASIC2R, and I can see all the devices online on eWeLink and on Home Assist, but then occasionally the devices in Home Assist will just suddenly become unavailable, but they are still online in eWeLink. As soon as I activate them on eWeLink, they pop back up on Home Assist. Can sit and watch and a few seconds later, unavailable again. What could be causing this? (Running Home Assist on Raspberry Pi 3B+)

Thx

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