hmmm,i never got bootloop when i enable Android Device Manager ,try flash with odin(cause you still in stock right?)
and then you solved the problem,but you loss your root acces :/
I have the same problem with both stock and root. Running android 4.1.2. A factory reset via recovery fixed the issue for me in stock.... I have no other ideas as to what is causing this weird and annoying bug...
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