Data Connection stops working
 

I have a unlocked sprint touch pro2. I am using it on ATT.

For some reason the data connection stops working after 5-10 mins when the phone goes idle.

Due to this I am no longer able to use Exchange activesync for my corporate mail.

A soft reset restores it but its again lost after 5 mins.

Someone please help this is so frustrating.

I have made use of 3-4 ROMS but all of them seem to have the same issue.