With your PS3 off, reset your modem and router.....
Turn them off for 1 minute, then first plug the modem in, then the router. Once their status lights are normal, turn on your PS3 and see if that helps.
If it continues, you might want to look around and see if there are any computers that are downloading things or tablets/smartphones that are downloading anything.
If it STILL continues, its likely your ISP....
After all that, you might want to look into assigning an IP address to your PS3 and forward your ports through your router.
I get you so horked up
Interesting. I am on Rogers high speed just outside of Toronto and the same thing is happening...
BUT, I play Dust 514 and it appears almost half of the usual number of players are currently effected. Typically there are roughly 7000 online this time of night and when I last checked there was just over 3000. Plus, corp mates are complaining of random disconnects as well.
So, I blame Sony.
It was a Sony issue probably from them updating the PSN store. You should be good to go now.