IMac losing connection with iPhone

When I connect my iPhone 3GS the phone syncs as normal but between 5 and 30 minutes after syncing the Mac 'forgets' the Phone, it vanishes from iTunes and the iPhone stops charging.
This has happened consistently over the last week or so. I am on latest OS versions of Phone and Mac, but the problem did not start immediately on upgrade.
The main problem is the stopping of charging since I leave my Phone connected overnight and now I get up in the morning and the Phone is out of power...

You're using the right port, have you tried a different port, different cable? One or both might be faulty. Do not use the keyboard port. Many iMacs have USB 1.0 (or 1.1) ports. This means that they only work with devices that supply their own power, not those that need power sent to them via USB 2.0.
The iPhone is a USB 2.0 device, so it needs to draw power from the USB port – something the USB 1.1 ports on the keyboard can’t offer.

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