Just a quick check.

1. New tapes?
2. Cleaned the head recently?
3. Used the bottle rocket cleaner? (link follows for example)
http://www.amazon.com/Giottos-AA1903-Rocket-Blaster-Large-Red/dp/B0013J0502

The odd thing here is you say the screen shows it during recording. Does this have some camera feature or does it happen at exactly a number of seconds?
Bob