Unresponsive screen during call

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http://forum.xda-developers.com – Hi guys I have a xperia s on jellybean .211 firmware. Just wanted to ask if anyone else experiences an unresponsive screen during a call? What I mean is whilst im in a call the back button doesnt work so I have to press the home button. I can browse around the phone just fine, however when I go into my messages or whatsapp I cant click into a conversation at all. If I get into the conversation, I cant type a message or anything Sent from my LT18i using Tapatalk 2 (HowTos)