Sync and Wifi problem (iphone 3G 3.0)

So I've been updated to 3.0 since launch day, and I've been having these problems.
First, when I plug my phone into my pc to sync, sometimes (more often than not) just disconnects and reconnects in a loop, and will do so until I unplug it. I've tried every port in my pc, and it still does it. I switched it to my laptop, and no problems. I've reinstalled itunes and the mobile device drivers, and can't think of what else I can do to fix it.
The other problem is that my phone won't stay on wifi when it is connected. It will continually switch on and off, and my browser and apps will tell me that I don't have a connection to the internet, even if I have 3g service while the wifi is disabled. Just started doing that with 3.0. I've reset my phone, powered on and off, and factory restored it twice. Not sure what else I can do, thanks!

Restored my phone again, still no change.

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