Computer USB port drains battery, won't complete sync'ing.

Lately I've had a problem where, when I connect the iPhone to the computer to update the podcasts, etc., it drains the battery rather than charge it. In addition, the sync process never completes. Plug the iPhone into a standalone charger and the battery charges OK. I've done a 'restore' twice, but am still having the same problem. The USB port is powered OK since I can connect it to an axillary battery (same cable) and it charges properly. One more note, a few seconds after connecting the iPhone, the little battery icon changes from 'charging' to 'charged'. Any ideas?

Okay, umm.. Just installed iOS 8.1, when it finished; my computer recognized it. But then it suddenly just started frantically beeping(Windows Connect/Disconnect bleeps). Moved it to a new port, and it no longer detects it. Moved it back to the original port, and will no longer detect it..

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    Hi bonedaddio,
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