Support Sony Xperia U keeps cutting out during calls.

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http://androidforums.com – Hi there, My girlfriend has just bought an Xperia U and it seems fine except for whenever she receives or makes a call, it just randomly hangs up the call and she has to keep ringing back. Do you any of your guys know whether this is a common problem to this phone generally or whether this is a dud phone? She is on the GiffGaff network in case this is relevant. Many thanks (General)