Just for giggles, have you tried plugging it into a different controller?

I helped someone a bit ago with one he swore was dying as it was making noise. Well it turned out it was the controller was causing eratic behavior of the disc.

Mark
Pio 94,SB3,BD30,A35,Pio 48AV.Pronto 7000 controlling all. Getting ready for 22s, 150 & QS8s.