So my friend has had an Incredible since release and, in general, has had no problems. (As opposed to my own, which suffered a tragic mishap with a wooden roller coaster)

Anyway, just recently - in the past week, particularly - his phone has been vibrating randomly during phonecalls. He is not receiving notifications or any incoming emails or texts, yet the phone is vibrating... vigorously. In general, in will vibrate in sets of 3 or 4 short bursts, beginning with the time a call is sent or received, continuing through the duration of the call, and again when the call is ended. At first I thought it was an issue with his ROM, and then his mother started having the same problem. Here's the kicker though, while he uses a rooted Incredible booting CM7; she uses an absolutely, bona fide stock Incredible 2.

I'm stumped.