Ok i have a problem with my PS3 wireless connection that I cant seem to find through searching so hopefully somebody here can help.

My PS3 connects fine with the network as soon as its turned on. I can browse the internet, download updates and use the playstation store without fail. But once I try to play multiplayer on Resistance: FOM it says net work connection failed. Also if I am playing the single player campaign the playstation network repeatedly signs in and then signs out throughout the enitre time I am playing. If I quit the game and go back to the XMB the network works fine.

Has anybody else had this problem and if so any solutions. Its really starting to bother me since this is the only game I have and want to play at the moment. Again any help would be apreciated. Thanks.

check the stickied wireless router poll thread first and see if your router is listed and with possibly what settings you need to use with that router. Often this problem has been linked to the broadcasting of the SSID information in the router and turning off the broadcast has fixed some people's problems but not all. You really should read the stickied post and see if your router is listed and then if not a) add a post there and b) come back here and fill in the blanks.
We'll need so more info to help. ie. Router Type, latest firmware yes or no?, internet connection, distance to router, ect... You get the idea.