I have a late 80's or early 90's ES Sony CD player, I think a C8ESD model off the top of my head. I noticed lately I'm having an issue with the CD tray. When I hit the open button on the unit, the tray comes out and will 'disc skip' to any of the 5 spots I want. After loading CD's, I then hit the close button and it will close half way, then open and rotate to the left 2 discs then back to the right 2 discs then back to the left 2 discs and to the right 2 discs then stop. I will then hit close again and it will close half way, open and repeat the above. The 3rd time I hit close it will close and play as it should. Is there a sensor of the door (like a garage door sensor) that is maybe dirty or misaligned and causing this or?