HTC G2 sudden data failure, repeated connection attempts

HTC G2 sudden data failure, repeated connection attempts

I've had a HTC G2 with t-mobile for about 3 years now with Android 2.3.4
(never rooted).
Yesterday the phone suddenly lost the ability to connect data networks.
The data connection icon appears for a few seconds staying white in color
(a green color indicates full connectivity) then disappears.
I made a video to show this process (sorry about the quality) you can see
the data icon in the top part of the screen.
http://www.youtube.com/watch?v=JhdPh34AAcM&feature=youtu.be
This process will go on repeatedly and drain the battery in the process. I
tried setting "only connect to 2g networks" but the same thing happens.
Any help is great appreciated; thanks.