I took care of mine really well as well, but after about 18 months or so, the cell signal started to get erratic and within a week stopped working altogether. Right before it started, it had a small drop on some carpet that I didn't think was a big deal.

Afterwards, I did some searching on the forums and found lots of people had similar cell signal issues many of which didn't sounds like they had any explanations. I got the impression that it seemed to happen to quite a few folks around the 18 month range, and it's one of the reasons why I'm hesitating buying a replacement.