Just some more info on the error to see if we can find a pattern:
I've also had this error happen to me.
Looks like it happens when I switch on my phone, and enter an app, or the phone wakes up to an app instead of the home screen. The is different, Waze, Facebook, Booksmobile, various games, etc. and the error shows up on all of them.
Once I click the button it doesnt come on again until my phone is switched off and switched back on.
I can also confirm that it is a very recent problem, Mar 15 and I havent done any updates or anything to my phone recently to warrant the change.
I wasnt making any purchases, or interacting with the app store at the time. I was playing audiobooks though, or trying to switch out of that app like duke had mentioned.