Hi there and welcome
Is it only one game that is having an issue or no games can get online?
Please let me know
Sorry the answer is not clear, I need to know please
Can you power off the PS3 and remove the power to it as well as your wifi router.
Wait 5 minutes, then connect the power to the wifi router
Wait 5 minutes, connect the power to the PS3, power it on and tell me if it now can get online please.
ok, but this is more then just restarting it...
Whats the make and model of your internet router?
On the back of it is a reset button. Using a paperclip, push and hold the reset button in for 10 seconds then release.
Once done, power off and remove the power to the PS3
Wait 5 minutes, power it on and tell me if it then gets online please.