There are a few options that some have or have not had success with, none helped me. Hopefully one can help you! I'm on rogero 4.55 v1.00 spoofed to 4.60 CEX

. If you have done some searching this is an error that is happening to plenty of people as it did in the past.
First would be try different games or different accounts just to be sure,
2) Restart your router/modem and turn it back on in 3 minutes (
along with your ps3 ),
3) Change your DNS settings to either
208.67.222.222 (primary)
208.67.220.220 (secondary) or
8.8.8.8 (p)
8.8.4.4 (s), (in your internet settings)
4) Restore file system and/or rebuild database,
5) Update your ps3 system if possible which for anyone on CFW is a big
no no 
6)
Format your HDD. I do not recommend formatting your HDD as it sucks to lose everything and it may not work.
If you choose to use any of these remember
I am not liable if it still doesn't work, you are on OFW now

, or you lose data, again I hope one of these will work for you.