5S kept crashing and restarting from Numbers

So I use Numbers for spreadsheets at the gym to keep track of my lifting progress. Today was the first day at the gym with my 5S. I put on some music (new Avenged Sevenfold album is AWESOME by the way) and open up Numbers. I was able to open up todays workout and all the sudden my screen goes blue for a second and then black. Totally shut off my iphone. It restarts fine and so again, put on some music and try Numbers and same thing! Kept crashing. Tried it without music and same issue.

I ended up just deleting Numbers and will try reinstalling it, but just wondering if anyone is having any issues like this?