Intermittent No Ring No Missed Call Notification

[hween123]

My Touch Diamond has been acting up. After receiving a voice mail notification when my phone clearly didn't ring, I decided to do some tests. On a fairly regular basis (with me calling the diamond from a land line), the phone will not ring, nor give a missed call notification.

If I switch to airplane mode and back, it will work for a few calls, then stop, then maybe work again.

I flashed back to a stock ROM (can't find a legitimate shipped ROM for MTS, as it says c4rbon kitchen in the Rom version field), and the problem still persists. In fact, when I am calling the phone (and it is not ringing), I can see the signal bars go from full to zero, full to zero, full to zero for the duration of the ring. Again, my land line call goes to voice mail and there is no missed call notification on the Diamond.

Any advice would be appreciated!