Green Screen

I have an s5 five , total stock, and upgraded to marshmallow. Sometimes when I turn on the phone I have a green screen with a status bar at the bottom with the words android is starting apps. It never goes to the optimization countdown of apps and then it just goes ahead and boots without problems. I haven't cleared cache or reset after the upgrade from lollipop and this only happened after the most recent security patch. Anyone know what causes this? Don't want this to sometime throw it into a unrecoverable loop.

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