Whenever I'm playing a game or just using social media my iPhone 6 32GB kicks me out of the application

Good all.

Hope you are well.

Im having application issues with my iPhone 6 for a while now. Whenever im playing a game or just using social media is kicks me out of the application. I have tried numerous solutions: hard reset, back up and restore, factory reset, reset all settings and even reloaded the firmware but still the issue is there, any idea what it could be? My battery health is currently at 94%.

Thank you in advance.

Ruan

[Re-Titled by Moderator]