I have a Samsung Galaxy s6 that sometimes will pop up a message suggesting that some apps are consuming too much ram or cpu. And the following screen. I haven't been able to figure out what app it is though that seems to be acting like good samaritan on my phone.
It doesn't show on recent apps list and once I tell it to perform the fix, i can't interact with app or go back to it.

adb shell dumpsys activity activitiesandadb shell dumpsys window windows. Share with us the two outputs and we will help in pinpointing the app. – Firelord Sep 09 '17 at 13:20