I just got this used Surface off of eBay. The top left portion of the screen doesn't detect any finger movements, flipping the Surface around makes it consistent (so upside down it's the bottom right portion of the screen). Is that how touch screens break? Portions stop working? I thought the entire touch would stop working? Any ideas? I've applied all updates. I've refreshed the system twice already. I checked online and the Surface is still covered by warranty from Microsoft. I don't have the original receipt and I'm currently out of town until August. (It'll still be covered by then). What do you guys think I should do? I messaged the seller telling him about the issue. Any help is greatly appreciated. Thank you.