Well I got back into the 360 world a little over a month ago. I got one of the new "Jasper" units. And up until 2 nights ago, I wasn't having any issue and was pretty happy with it. Now since the update, it's locked up on me 2 nights in a row.
Could be a coincidence, could be a bug in Fallout. But I'd been playing Fallout for some time without any issues, but after the update, then the freezes started.
It's frozen up twice on me in Left 4 Dead, not to mention a few close calls in call of duty too.