free android app resets

[roadrunner]

I just downloaded the free prime app for android. Whenever I exit out of the app with the back key, the next time I start the app it resets; clearing all memory, variables, and setting. This doesn’t happen when I exit by first taping shift off, then tap the back key.

Has anyone else observed this this behavior, and will it stop if I buy the pro version?

android version: 4.4.2

-road