ZHA - all Hue Dimmer switches dropped off and won't re-pair

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I have over 60 Zigbee devices, and “something” happened yesterday, such that a whole lot of them dropped off the network, and then slowly came back. All but my 6 Philips Hue Dimmer switches that is.

If I try to re-pair them, ZHA will often get stuck on “starting interview” or “configuring”, but sometimes it pairs - however then pressing one of the buttons either results in a red light or no light - not the expected green light. Although they might also work for 5 minutes and then nothing. And obviously no event in HA when this happens. A search shows nothing useful, so it’s just me I guess. Has anybody seen anything similar? It’s sus that it’s all of the same device on the same day.

I turned on logging and got 5,000 messages in one minute, which seems very chatty, but none look worrying.

I was on channel 15 because it seemed less cluttered, but now my own wifi has shifted itself to the same area (don’t buy Deco wifi mesh because you can’t control the channel). I’m going to try changing to channel 25 to see if it helps, but none of my other devices are struggling so I don’t hold much hope.

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I switched back to channel 25 and now the Hue dimmers will pair and stay paired. When switching back a lot of other devices were dropping off for a day or two, presumably while the new mesh was “settling down”. Now a week or so later, everything seems fairly stable. But whoever thought it was ok for wifi plus bluetooth plus zigbee all on the same frequency mustn’t live in a high density area. In my case, the ZHA diagnostics shows an energy scan of 75 for channels 12 and 25, and 99 for all others.

And for anybody interested, I use a SkyConnect in a USB 2 port on a USB extension that is suspended away from other electronics. And my server is in a fully enclosed metal rack with glass door. And I have numerous Ikea repeaters around the house thanks them being bundled with the 10 Ikea blinds I own, plus other powered zigbee devices.