and i thought it was just me!
Just had my 16gig 3g iphone replaced for same reason. first the bluetooth started acting up intermittently, not synching to the carkit its been setup for months with. Then wifi started getting worse, where first i could see all wifi networks, then just mine, then i couldnt even connect to mine, finally i couldnt see my, or any other wifi networks. Yes it was on, did all the normal troubleshooting etc. Sent it back to apple after speaking to support, back in 4 days with brand new phone. Wonder how common is this fault?