My Galaxy S4 keeps resetting my lock screen password. Why is this happening?

A

AC Question

Twice in the past 2 days my Galaxy s4 has randomly (even interrupting a game) asked me to reset my lock screen password with no cancel option.
The first time, i hit the home button to open my phone and it was there, no way around it. shut off the screen, opened again, still wanted me to reset my password, so i did

The second time just happened to me DURING me using the phone. I was playing Fallout shelter for 5 10 mins when the screen went blank then prompted the same thing... I changed it back to the password i had before but i cant figure out why this is happening.

I googled and no one seems to have this issue.

Please help.