The Model 1050 had problems with EX flagged soundtracks and the proprietary 6.1 Surround mode. The very first batch of 950's shipped out (as in the first few dozen at most) had a chip in the DSP that would sometimes overheat due to a voltage/chip mismatch and cause a brief dropout from time to time, but that was resolved and all affected units replaced.

Have any other discs displayed this behavior? Also, which Harry Potter disc is it?