I've owned an iPhone since the 3GS was the then current iPhone. Saw something I never saw today, one of my apps (The Wikipedia app) was greyed, and saw "cleaning" underneath it. A google search about that tells me it was cleaning cache files. Every thing I read (including a thread here in the iOS 7 area) says that if this is happening, you're very low on space. That is obviously not the case with me, as I have 33.6Gb available on my 128Gb iPhone. So it can't be that. Anyone have any other ideas why this is happening? Perhaps more recent iOS versions will clean app caches on their own periodically vs the "low on space" reason from before?