In call volume problem

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http://forum.xda-developers.com – Recently I've noticed a problem that I most certainly didn't have before. The problem is that the in call volume keeps going down to around 50% with every new call. When I receive or make a call, the in call volume is around 50%, which is not enough for me. So I make it louder to 100% and can talk just fine. Unfortunately, with a new call the volume goes down again to the same default volume around 50%, which means I have to turn the volume up every time I receive or make a call. This is really annoying. I'm absolutely positive that I did not have the problem before. What might cause the probl (HowTos)