Can't connect to internet half the time

I recently bought a PS3 and it was working fine for a few weeks when all of a sudden the internet decided to stop working. This happened a few days ago, but right when I pressed play for the MAG beta it suddenly came back. Now it isn't working again and I've been searching for the past two and a half hours for a fix with no luck.

This is what I have tried to do to fix this:

1. Unplugged my Blue Tooth headset

2. Disabled Media Servers

I have a Motorola SB5101 Modem, Thanks for any help you can give.

I'm affraid i can't help you but i had this problem last year, i searched and found no answer, in the end i replaced my wireless router and it worked fine. Are you running your PS3 internet through a wireless connection?

So your PS3 wont sign into the PS Network? Have you tried an Internet Connection Test in Settings > Network Settings. Your internet works fine on a computer right?

So your PS3 wont sign into the PS Network? Have you tried an Internet Connection Test in Settings > Network Settings. Your internet works fine on a computer right?

Dahaka-UK