Storage Space running out - can't access phone at all
My wife's been getting this on her Ls740 lately. A temporary fix is to go into settings / apps and sort by size. The app using the most space will show up at the top. In her case it's the "google play services" thats going crazy and using up all available memory (currently at 2.4 gb). Click on it and select "clear all data". That fixes it for about 24 hours but then it happens again. I still have not figured out whats causing it. I have the identical phone and do not have the problem.

I did try a factory reset too but it didn't solve the problem.