[Primenall]

Not sure, I had the same problem and it was simply a bad usb cord that seemed fine but really wasn't, even though it never gave me a problem at all using just Activesync it would do that while tethering.

A new cord solved it, until then you might want to try seating the cord in the phone all the way then pull it back out a tiny tiny bit, barely at all, that worked for me.

It could also be the usb connector in the phone itself going bad.

I don't have any experience with cricket roms but you could always flash a different rom just to see if it affects it at all too.