I did break down and installed Marshmallow. 2 things. 1. Battery is HORRIBLE. Typically leaving phone set, overnight it drops from 100 - 94. Last night 100 - 82. Also, go into Data to disable background apps, (some) I get Unfortunately Android stopped working and it takes me back to data screen. Think I know why, cause they moved it to the Battery part now, under optimization. BUT, take notice (Verizon) some you cannot disable background. IE: Google playstore, Verizon apps. I look and of course google playstore is running, I stop, Verizon messages running, I stop. Why would they be running, when not in use? And why didn't they do away with the ability to disable background in Data instead of giving an error? This is of course Verizon.