Sony BDP S350 Freezing

[rockhpi]

I had not updated my firmware for probably two years and never experienced any problems until I bought X-Men First Class. It refused to recognize the disk so I plugged in and it loaded 9 updates. Since then, approximately a quarter of blu-rays that I play freeze up at some point and I have to skip forward. The disks aren't dirty and play fine on a PS3. Is it possibly to roll back the firmware? Is there something else I can try?

I did plug in a 2GB memory stick, which I never needed before, but that didn't help.

I read somewhere that if I set the player to allow the sound system to decode the audio, it should freeze less, but I believe I have to use the optical input to the sound system and my PC currently uses that. And prior to the updates I loaded, this was never an issue.

Any ideas?