Support keep losing the usb connection after mounted

Okay this is starting to irk me, i've been trying to teather using PDA net through my stock USB cable, i plug in the cable the phone and computer reconize eachother i mount the cable through the notification bar, start PDA net, everything works great, i start watching a show on fox.com and get 15-20 minutes in when i get the usb device being disconnected tone, look over at the phone and it says preparing SD card as if i had unmounted it, if i try to unplug the usb and plug it back in it charges but i never get the notification to mount the cable again. I have to power off the phone and power back on to fix this. WTH is going on here, i know a lot of people were having issues getting the usb connection going but that appears to be fixed by removing and reseating the sd card, which i have done many times. I will have a perfect connection with the laptop and phone sitting still on a table when i randomly lose the connection and have to reset the phone. Any ideas?

 

i'll try that, thanks, although im not sure if its an issue with PDA net or the phone, because when i lose the connection i cant even mount the phone back to the computer at all to transfer data or read the card with out having to reset the phone

 

Yeah I have no idea why it does this, it is terribly annoying as teathering is the only way I can get my laptop online right now