Recently used apps button is no longer working, how can I fix this?

[AC Question]

Recently used apps button is no longer working

I am curently using the Samsung galaxy s5 active and my recent apps button is no longer working. Everytime I press it nothing happens. I have tried restarting my phone multiple times, thinking that might fix the problem, but nothing is working.

 

[B. Diddy]

Re: Recently used apps button is no longer working

Welcome to Android Central! Try wiping the cache partition, which won't erase any personal data: http://support.t-mobile.com/docs/DOC-10404

If that doesn't help, try booting into Safe Mode, which temporarily disables all 3rd party apps. https://support.t-mobile.com/docs/DOC-10696

If the problem disappears in Safe Mode, then something you installed is causing the problem. You may have to uninstall apps one by one until the problem disappears. If the problem persists in Safe Mode, then it's more likely to be a hardware or firmware problem.