Hi, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, bear with us; re-confirm and post back with the complete model number of the Panasonic.
Still, proposed preliminary tries (if have not been done) would be to tap gently and exercise the DISC EJECT lever. It may also help to force clean through the narrow gap of the lever and casing using compressed air.
Additionally, consider/try a RESET.
All others would be internal.