http://www.joystiq.com/2010/02/28/psn-is-down-some-titles-experiencing-game-crashing-errors/
I left my PS3 running for the entire day and it's still running fine now (played LBP, Heavy Rain demo and browsed PSN store).
Some experienced problem when they turn on their PS3 for the first time in a long while.
A wide rash of game-crashing errors is spreading among the PS3-owning community at the moment, most of which can be chalked up to a 8001050F error code. This has led to a variety of unfortunate side-effects for those affected, including corrupted trophy information and an inability to access the PSN. When combined, those two issues prevent players from launching certain games, such as Heavy Rain, without being kicked back to the XMB.
...
Sony has acknowledged the issue, and is "looking into it." We've yet to hear an official word on what the problem is, though it seems to be a bit larger than just the PSN. Owners of PS3 Phats are reporting that the date on their console has reverted to 12/31/1999, which is likely the cause of the data-corrupting errors.
I left my PS3 running for the entire day and it's still running fine now (played LBP, Heavy Rain demo and browsed PSN store).
Some experienced problem when they turn on their PS3 for the first time in a long while.