Sometimes during a call I'll go to hang up but no matter how many times I press end, nothing happens. I can't put the phone on speaker phone or anything. the keys at the bottom of the device function perfectly during this period of time, and you can get to the power off screen but can't select any option. It doesn't just happen while talking on the phone either, I've pulled my phone out my pocket and couldn't slide it to unlock due to the screen not picking up my touch or something and the problem just goes away somewhere between 5-20 minutes later. It's really frustrating not being able to answer or hang up calls and being left without a phone until it decides to work. I've also experienced the touch screen pressing keys i didn't press and when i hit the screen, it typing like 5 letters i didn't hit. Sometimes I can't type a message because the keyboard is impossible to use considering the screen is being so inaccurate and this applies to not just texting but happens sometimes when dialing numbers or selecting apps. This problem also just magically goes away after a few minutes, but is extremely annoying. Has anyone else experienced similar screen issues?