I guess the most obvious thing would be if there are any obstructions between the router's signaland the ps3...mainly walls, floors, or ceilings,I guess. Wireless is more unreliable by nature because of the collision avoidance. Even being hard-wired I still get disconnected from the PSN network while idle sometimes, but never in-game. You could try eliminating things like WEP authentication or whatever wireless security you're using and any firewalls, maybe put the ps3 on a dmz but it could just be a weak signal...
Go into your PS3 settings and turn off media sharing. The Linksys routers seem to have a hissy fit when working with this option, plus it is easier just to get a thumb drive and exchange files that way.
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