Perhaps the combination of these cc2652 dongles, IKEA buttons and zha causes a weird edge case where they don’t always pair correctly and then drain their battery really fast so you’re then hopeless to get them to pair again. Or perhaps it’s down to button firmware version so it’s a gamble when you buy them.
@mattdm:
Since my last post 9days ago it still all works solidly after swapping the batteries in the buttons and using zigbee2mqtt instead of zha. I had only 1 instance where the buttons stopped working but a reboot to the pi fixed it. Other that that it’s been solid. But this is a really tiny network.