Problem with auto switch between GPRS and 3G/HSPDA

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http://forum.xda-developers.com – Hi, I seem to be having issues with my S3 (on 3) where if it rolls back to GPRS when out of 3G/HSPDA coverage it will then not switch back again when I enter 3G coverage. Has anyone heard anything similar, more with the phone than the network in question (Three)? I recall hearing one of the phone support people mentioning that this was a known issue, but can't recall if it was this exact problem. Anyone? Thanks. (HowTos)