Glue and seals weaken with exposure to temperature extremes in both directions. I found this out the hard way too.

I spent all day out in below freezing temps, when I got back to my hotel room and my smartband (not pebble) started to warm up, the screen just fell off. Everything still worked and the screen was lit up. Fortunately I discovered it before I ripped the screen off on something. When I got home I was able to glue the screen back on and it's been operating just fine, of course it's probably no longer waterproof.

Hoping this thing holds out until I get my Pebble.