I’ve updated both of our phones to Android 6.01 (Marshmallow) and it totally breaks presence detection. It is because it adds something called Doze which decides to put the phone into Doze mode if it isn’t on or moving. This turns off thing like data. I’ve not yet found a way to disable it unless you root the phone. I know it is Doze that causes the issue as I setup a galaxy s2 with v4.4 and 14 hours later it hasn’t skipped a beat.
Anyone else have this problem? this is making it as bad as the iphone.