Bug Problem Please Help

[KP2128]

When I tap Back Button I am unable to close the app

Pressing bck button several times all not helping me 

Please suggest somethin What can do ??

[Anonymous]

If no button is working!
Then may be you pinned this app
Press menu button and back button at the same time

Do you have 2 samsung devices??

[KP2128]

That's not the case
Suggest something else

[Green_Grass]

100% working solution

Press and hold power button for 10 seconds
Don't click anything
Just press for 10 seconds

Your device will restart forcefully
And it will solve

[Anonymous]

Press and hold the Volume down and Power key for 7 to 10 seconds 

[Green_Grass]

No need
Just press and hold power button
It works

[Anonymous]

Not working
I tried

[VedantKalore]

Yah power + volume down for 7 second make force restart

[KP2128]

If I press home button then I can exit the app
The problem is after pressing the back button the app should get closed but it doesn't, how to solve this ??

[VedantKalore]

Back button not working, on which security patch update and device?