This is weird, but if I didn't know any better, I'd say my DROID was skipping while playing music. I was riding my motorcycle with one earbud in. The music would stop for several seconds to a minute at a time. At one point I thought the phone must have just locked up for a couple minutes, but then it started playing again.
When I got home (roughly 1 hour commute) I had a missed call and 3 more tweets than when I left. I understand that it might blank out for a second for a missed call or tweet, but that wouldn't explain that it was probably off 40% of my ride home.
This has never happened when I was using it at the gym or mowing grass.