USB Connection failed or broken - power problem?!?

Hi,
I had problems with Windows and my iPhone. First it sometimes did not find the iPhone. I checked all the drivers as described on the Apple page, but everything was OK. I deinstalled iTunes and reinstalled it: still no connect. I booted several times, too. That time the batetry was only half full.
Next day, the battery was full. I plugged it in, and it was immediately recognized. But: this time during sync the connection got lost. Although retrying often, it just did not work for syncing files.
So: I disables WLAN and set the screen brightness to the lowest value, and now everything works.
Did anyone else experience a correlation ebtween battery level / power consumption and the quality of the USB connection?!? Or am I turning nuts?
Bye, Uli

Thanks for the tip. I did a few more tests, and it seems to be true.
Here is what I tried: connect with 80% battery, works for the USB port on the back of the case and for 1 of the front ports.
Connects with 20% battery only work for the back USB port.
So there seems to be a combination of problems with my PC. It is correlated with battery level of the iPhone, but there also seems to be some kind of software / driver problem with the front port.
Anyways, thanks for the tip -> solved from my point of view.

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