Hi. I've been using arc for a month and have some small bugs. first is all known wi fi issue, and second big one is screen issue. Screen is getting unresponsive in the middle, so some times I cant unlock phone or pick up a call. If this happens I have to press lock button and then it fixes. I gave it to service but nothing have changed. also sometimes mic and vibrating alert isnt working. what do you think, this is software or hardware problem?