On my Samsung Galaxy S6 (Android 6.0.1), sometimes the back button starts firing by itself, hence closing the current app or going back on a page.  Sometimes this happens in bursts, making the device unusable.

As reported [here][1] and [here][2] it's a common problem. Users report as possible causes:

 1. Device overheating

 2. Use of data connection (perhaps causing #1)

 3. Hardware problem (interference from speakers on the capacitive touchscreen)

 4. Moisture (triggering false contacts on the capacitive touchscreen)

In my case, I've noticed it happening especially when I use the Twitter app, which makes large use of the phone capabilities. Running Smart Manager and closing all running apps sometimes solves the issue, so it might really be #1.

A factory reset does not solve the problem. Users suggest as possible workarounds, related to the causes above:

 1. Let device cool down

 2. Disable data connection

 3. Lower volume speakers to less than 75% (?)
   
Anyone found a definitive fix for it?

Note: Related to an older Galaxy model: http://android.stackexchange.com/questions/122540/galaxy-s4-back-button-pressing-itself

  [1]: http://forum.xda-developers.com/galaxy-s6/help/s6-pressing-button-self-capacitive-key-t3146253
  [2]: http://forums.androidcentral.com/samsung-galaxy-s6/519860-galaxy-s6-capicitative-back-button-spamming.html