I have Mac Book Pro that I purchased in September. It works great, except that if I leave it on overnight, it won't open any windows the next morning and must be restarted. Additionally, it often gets "hung up" when I'm in a page, and then I must reload the page. Although these are not terribly annoying issues, I've heard that for a Mac, this is not normal. Does anyone have any advice for how to fix this? Thanks in advance!