That is exactly the situation I had w/ my 3T. Even adding the ST app to the “do not optimize” list in the advanced battery settings didn’t help. Whether OP or ST is the culprit I’m not sure either, but the situation sucks nonetheless. If you want to take 15-20 minutes and buy a couple apps (useful even on their own), you can still achieve what you want. Take a look at this thread: [HOW TO] SmartThings Presence reporting using Tasker/SharpTools/AutoLocation. It has worked perfectly for me and my wife over the past few months. It has been, by far, the most reliable detector of presence for me (better than ST app, Life 360, & the ST Presence sensor).
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