About a week and a half ago i was using my Acer Tablet and the Screen stopped responding to touch! i finally had to hold the power button a few seconds till it shut-down. i turned it on again and i couldn't type my password so i shut it off the same way. the third time i was able to type my password and use it for a while and then it stopped responding again! so now the screen stops responding at different times, start up or a few minutes in or works perfect till i turn it off. the volume still works and if am watching a movie it just keeps playing and sometimes it starts to respond again. everything else works fine. i already changed the screen touch to high also. i've had it for a few month without any other problems. so does anybody have any ideas of we its doing this?