Several of us had that issue. Leave it plugged in and set to not go to sleep, and let it sit there. Could take half an hour or more. It seems that once it loads, it works fine. Other solution is find the largest thread and delete it. You will have to do the same thing with waiting, and it doesn't always show that it is doing anything, but it will eventually delete, then everything should be fine. Hopefully that is what your problem is. Seems to have been for everyone that has reported that problem anyway.