i have the same problem with S5. i had s4 for 10 months it had connectivity issues with network, my company RMA'd it and got s5 and now this has different issues. pretty irritating. i have no screen protector, just a case thats it. when it works it works, when it doesnt its irritating, u cant even take calls sometimes when your swipe is not recognized. !! i switched from iphone 4 to android and was happy for a while, now i hate these samsung phones !! i have increase touch sensitivity too and no use. if i take it back for return its going to be hard to prove. what a pathetic piece of technology. cant beleive i have to live with this for next 2 years.