1 of 1 people found this helpful
Try to check your handset's network mode.
Settings > More/More Networks/More Settings > Mobile Network > Network Mode > Automode/Autoconnect
Are you experiencing this regardless of the location?
If you think that you are in an area where there is 3g all the time it is best to set your network mode to WCDMA or 3G ONLY (not "preferred" and not even "Automatic") so you would not be bumped off in case there is network congestion.