Whenever I am watching a movie or playing a game and there is a sudden increase in volume (such as an explosion) the volume lowers suddenly to "normalize" it. After a few seconds it returns back to normal volume. I've scoured through the settings on my TV, the Xbox 360 and the PS3 and have found nothing that fixes the problem.

Change battery

Sounds like you have output transistor problems. Does it have a red protection light that comes on when it shuts down? If it does it will need serviced.

Sounds like it's overheating.It's a common problem with alot of Toshiba's.

well if it stops a few minutes in. then its not the ps3, its that specific disc thats damaged.

plug off you tv and back on after 1 minute, check the intelligent volume control, and that's solved

You need a new blu-ray laser. model number kes 400aaa. takes about 30mins to change out.

1.You Should Try to clean your disks 2.put one in and go to games or videos depending on what u r doing and if your ps3 detects there is a game in there press triangle on the disk icon and select play 3.if that didnt work go to http://www.Playstaton.com/Support
Hope it Helped!

Does it do this with all Blu-Ray movies?
Have you tried a different HDMI cable?

HI
This may not help, but you can try to lower the resloution to another widescreen format.
I'm thinking you may have your resolution maxed out and the video card is having problems with the movie games because of that. Possibly not enough video memory
Movies will work fine at lower resolutions, Not sure about all the games but they probably will too.
Fran

There should be a volume adjust on the center channel. This is done by the remote exclusively. You may also wish to compress the sound using the dynamic range compression button or so labeled.