I have an 64gb iPad that I purchased 11/2011 so it has seen quite a bit of use over the past 4 years and has been problem free. Until the past few days. Now, after turning the unit on, after about 10 minutes, screens start jumping from one to another, all on their own....from app to app. Also the keyboard no longer works at all, will not type out any thing at all and the system asks for the Apple password but am unable to type anything in. When I turn the unit all the way off and restart it, all is well for a few minutes but it starts acting up again soon. Any ideas what is going on here?