2 words:
Gambryo engine.
This thing needs to be led out behind the shed and put out of it's misery! I'll dig the grave!
It's a buggy engine, always has been. Some have no issues, were others are plagued with them.
Sometimes you'll get a full day of play, then the next day you're lucky if last for 30 minutes.
I see the same issues I've seen since Morrowind. (It was slightly updated for Oblivion/fallout.)
So, I refer you, and the powers that be to reread my third sentence and hope the powers that be listened for future TES and Fallout games.
Quoting this just so that it gets seen more, because its so painfully true. Gamebryo is pure, unrefined garbage, and beth / obsidian really have no business trying to make games with it in 2010. They give it a nice effort with graphical bolt ons and gameplay improvements, but it will never solve the fact that it runs like trash.
I know there is probably a large investment in acquiring and learning to use developer platforms, but really. They arent some podunct indie developer, they are a juggernaut with fans screaming SHUT UP AND TAKE MY MONEY no matter what quality game they release.
Maybe thats the problem...