HTC Incredible :: Phone Rings Once Problem

My Droid Incredible will only ring once sometimes. I've tried custom ringtones, default ringtones, I made sure that it is not set to "Quiet on Pickup (or whatever)". It's not like it goes to voicemail or gets cut off, when I look at the screen, the caller is still there, waiting. I answer it and everything goes fine with the phone call. The problem is my work requires me to be on call alot, and if I don't hear my phone ring that first time, I may not get another ring. It typically only occurs when it is laying on a flat surface, face down but it doesn't happen everytime it is in this position. It used to happen less than once a day, it now happens more often. Today it happened three times before lunch.Anyone know how to experience this or know how to fix it? Verizon had me do the whole *228 thing. it didn't help at all. I'm on the verge of fully resetting my phone,