I found some registry changes that do the trick
go to HKLM\Comm\ConnMgr\Planner\Settings
delete the "SuspendResume" line
add a new line called "SuspendResume"
select the type to be String
set the value of the key set to "GPRS_bye_if_device_off"
select key name CacheTime
change the key value to 60 (for 60 seconds before disconnect)
Works like a charm for me. Shuts off the data connection automatically after the number of seconds you enter in CacheTime.
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