Why is my back button pressing itself?

[McCowzen]

My S7 back button presses itself, I'd press it once and it would function on it's own multiple times. I have to put my phone in power save mode to make it function just a bit better. It's especially dysfunctional when I turn on data. Plus the three-doted icon selects itself simultaneously with the back button.

 

[B. Diddy]

Welcome to Android Central! Does the phone have a screen protector or a poorly-fitting case on? Does it still happen in Safe Mode? https://support.t-mobile.com/docs/DOC-28008