I have this problem, among a MILLION others, with my Tilt 2.   I knew within the first few days that I didn’t like it, but then I had a baby and missed the time frame to exchange it.  I wish I did though b/c this is truly the worst phone I’ve ever owned.  It drops calls constantly, there’s a ton of technical problems with it, I sometimes get emails, sometimes not, it freezes all the time, and I need to take the battery out and reset at least twice a week.  It’s awful.  So yes, apparently it’s common for this phone to drop calls and not work like it should….