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.

Very interesting. I wonder if there's some compatability thing or network topology/density/something that screws them up.

Half of people seem to swear by them, and half hate them. They did seem great until I kept having to reconnect them every couple days, so I get why the lucky ones are happy.