Yesterday my screen went blank twice. Actually the second time there was a few lines that froze on the screen. I wasn't doing anything different, it just went blank. I shut the machine off both times and then turned it back on and it was fine. Battery power is at 10. Anybody experienced this? The MXT is only about 9 months old. It was cold out (Cold for Texas), about 35 degrees but it wasn't raining. Any ideas?