Hmm interesting I have 4-5 of them and quite like them. They've all stayed connected over a year except 1 which I just replaced the battery in and I think that fixed it. It was reporting 40% battery but would drop off shortly after connecting.

Aqara might be the ones with a crappy ZigBee implementation that doesn't roam right so if you move them or your topology changes, they'll drop off.

Same, I have scads of them (~8) and have never had connection issues with any of them. I made sure to only pull the battery tab and turn them on for the first time in their target location, maybe that makes a difference, and my zigbee network is quite dense, so there's no lack of mesh for them to connect to.

I'm 2 years in, I think, and I have never noticed any issues.