If you already have 3-1/63 then don't reload the OS. You'll just make more problems.

All symptoms point to an old / weak / dead laser. And trying to reload OS with a bad laser is a receipe for disaster.

Replace the laser, if you are technically capable.
Or replace the entire drive - very easy.
Or swap the Mk3 for a Mk4 and enjoy the faster speed, and the 3D maps.