With a new Fedora 16 x86_64 install on my Toshiba Satellite L510, I am experiencing system crashes after very approximately 3 hours of operation from boot time. The system just quits leaving the screen frozen and no reaction from mouse or keyboard, indicating most likely a stopped kernel. I checked the logs... nothing unusual at the time of the crash. Memory tested OK too.
I used the same machine with no problem using Fedora 15, which uses a 2. series kernel - Fedora 16 uses the 3. series kernel.
After some observations and tests, my suspicions are on the Realtek 8192se wireless driver for the 3. kernel. I am currently running the system with the suspected driver rmmod'ed and a Liinksys USB wireless adapter in place, and so far so good after 5 hours of operation.
As I don't have the skills or time to do a valid examination to make a bug report, I am just flagging this here in case someone else has similar problems and wants to do a more thorough examination.