Been doing some digging and I came up with the following by guyhunter over at GameSpot:
8071053D - Hard boot the PS3, turn off the PS3 to stand-by, flip off the back swtich and remove the power cord. Then shut off your modem/router, for about 5 mintues, then turn the modem back up first and let it sync, then turn the router back on(if using one) and let it sync. Reconnect your power cable and flip the back swtich up again. Then make a new network connnection.
One of the guys said he had to do it 3 or 4 times before he was able to get it working again.
At least it gives you something to try.
I would much rather go to my grave not needing my gun, than go there wishing I had it.