Hi, I have the same problem too. I bought one, liked the Sero 8 tablet so much, I bought another. The first one started to malfunction with horizontal lines, phasing in and out. The second unit after a few on and off sessions, started to phase in and out with horizontal and vertical lines. So it is obviously that these units are defective. I bought my two tablets from Monoprice. What makes it worse is that I also bought cases and likely will have to dump them. If I was rich it would not be a problem. Waste of money and more headaches. Good luck with your situation.