Galaxy S3 wont connect usb to PC

Hi all. I know there are a lot of threads about this issue. My S3 stopped connecting and I did the start in download mode once which fixed it. It stopped again yesterday. That fix no longer worked. I tried Kies which is a major POS. Didn't work.
Finally found an app at the Play Store called Wi Fi File Transfer. Simple and works like a charm over your Wi Fi network with a browser or Explorer.

Hope that helps someone.
Mike