Pop-up window always coming for setting PIN

I have downloaded free premium license for Avast mobile security. I have used App locking using Avast mobile security for Facebook, gmail and Yahoo mail account. When, I opened any of these account after security PIN, every 5 - 10 seconds, again pop-up window opens for entering of entering security PIN, which I feel boring. What is the problem. I have set 30 seconds as App security timeout. May I request to solve this irritating probelm.

Regards,
INP Gupta

This is the general topics forum.
You should post in the mobile forum.

https://forum.avast.com/index.php?board=37.0