In solo play the game freezes after each mission. I've exchanged the disc but still does it. Shows X-Continue on screen but won't advance. Camera moves around.

Try deleting the game install on your hard drive, if that was corrupted then just using a different disc wouldn't help.

I did delete everything I could find except couldn't delete trophies. Then new disc loaded for about 12 minutes again before game started.

Well yea it would have to reinstall the game, but did it keep freezing?

is it only wit this game ?
Does it freez up when you are watching a BD movie?
Is the console werry worm when you touch it and is it werry werry dusty?