Check rec tab keeps popping up

Ok, I've had this issue for some time now ... and just figured it out, hopefully your issue will be the same.

If you pop out the tape you are trying to record to. Look at the top, there is a small tab on one of the corners that will allow or prevent recording on the tape depending on which way it is positioned. If you slide it open the tape is locked for recording, if you close it, you can record. Try that and see if the problem goes away.....