At odd times I get an error messge pop up on screen saying " (App Name) not responding. Wait / report / close?". Problem is, these are alwys apps I am not trying to run at the time. There are usually 3 - 5 of these in a series. Its like someone/something else is working in the background. Wht gives, and what should I do about it? I'm using 4.0 on a tablet.