My iPhone 3G has been getting more and more sluggish over the last few months. The reception & call quality also seems to have been deteriorating recently and when I receive a text message, I get the message alert tone two or three times over a 10 minute interval instead of just once when the sms arrives. Is it worth trying a restore or is this a known problem? Or are these things symptomatic of a hardware issue maybe? Any ideas? Thanks, Mike.