Internet up arrow freezing

Hi, I have an issue with my desire with the up arrow on the internet freezing and locking up the internet for approx 3 mins, and the only way to get the internet back is to either wait approx 3 mins, put the phone into airplane mode and back to normal or switch the phone off and on.
I've read on other forums this seems to be a problem with t-mobile branded handsets.
I've sent the phone in for repair with t-mobile (whilst it was on android 2.2) and it came back the software reflashed but with the same fault so i upgraded to the stock 2.3 gingerbread rom but the same problem still exists happening about a dozen times a day.
So I was wondering if anyone else has had this problem and since rooted their phone and whether rooting had sorted the problem?
Thanks

 

It doesn't make a difference where I am it's happened in different areas of the country, also doesn't the stock 2.3 gingerbread rom debrand the phone anyway as mine now has no t-mobile splash screen or t-mobile programs.

 

It's nothing to do with the back button just locks up at any time. I've had my desire for 15 months now and have only had problems in the last 6 months gradually getting worse.