Support Data connection vanishes randomly

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http://androidforums.com – Have had this problem a few times, where I'm happily listening to TuneinRadio, watching Sky Go or browsing the web/twitter happily on H+/3G, and then the connection randomly ends. The green upload arrow keeps flashing but the orange download arrow does not. If I restart the phone it reconnects no trouble, but really annoying that it loses ability to download data when theres a high quality signal available. Any ideas? Im in UK on TMobile/EE, unlimited data package and Galaxy S3 on ICS. edit: come to think of it, think I used to have a similar problem on my iPhone on O2. (General)