Does this happens only to tapes which have been "used" (record or play) on the same camcorder ?
It looks like the camcorder is detecting "loose tape", i.e. the take up spool is not winding the tape "tight" enough. Try a cleaning cassette, or a trip to the repair shop for changing of belts and rollers, etc. ...., howeve, wait for other ideas...
I have a Canon GL1, and the way it appears is that I can put in a
tape and record on it once, but when I try to record on it again
later I keep getting the message "REMOVE THE CASSETTE". It does
the same thing when I try to play the tape. Most of the cassettes
I don't see anything wrong with, but a couple of them had some tape
hanging out of them. Is anyone familiar with this sort of problem?