I have a weird issue. I noticed on several occasions that when I wake up in the morning, my 4S is initially so much faster in terms of the "app animation" when app's are opening or closing. No noticable lag whatsoever. However, soon after, it goes back to being normal... still pretty fast, but getting some minor lag every now and then. Anyone know why this may happen? It would be nice if it was just always that smooth and zippy.