Iphone 4 repeatedly connecting then disconnecting at random times.

Hi,
Well that is just it. I have tried all the normal solutions seen when Googling the problem, uninstalling this and reinstalling that... none of it works. I didnt drop it, I didnt spill liquid on it. No physical damage occured to the Iphone, or my computer or USB ports, I didnt update anything, and it was working fine a couple weeks ago (last time I synced). I plug it is via USB (yes, it is USB 2.0) and, sometimes after a few seconds, sometimes just long enough to ALMOST finish a sync, it disconnects. Then it reconnects, and it does this repeatedly. Sometimes it will stay connected until I click sync, then 'poof' it disconnects.
It did make it through a sync once but it didn't try to back up the Iphone, and it didnt add any songs.

Thanks for the suggestions.
I must point out that there is no other device I own that has ever shown connectivity problems on said computer and even now, even when charged to 100% I still cannot stay connected through a sync. I havent had any trouble with the phone since purchase about 3 months ago other than this connectivity issue (very recent) I have uninstalled and reinstalled all versions of Itunes compatible with the phone to see if there was a problem with an update. I have done this methodically and according to Apples instructions on how to uninstall / reinstall.
Now, for the restore suggestion. This may have worked, had it stayed connected long enough to make it through a back up / restore cycle. It didnt. Now, on the data breakdown that I see when the device is connected to Itunes, I get a nice red area of unknown data allocation. The connectivity is just like I was plugging it in and unplugging it repeatedly. Sometimes it will connect and disconnect 3-4 times in the space of 2 minutes. Sometimes it will make it through all steps of the sync, until the "finshing sync" part, and then at about 90%, it stops as it has suddenly disconnected itself.
Money well spent I'd say. As a first foray into the Apple world. I am truly impressed.

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