I'm on 15.5 still.
One thing I have noticed in TeslaMate, which I haven't updated in a few weeks - so I don't think it's that, is that now when I wake the car up when it's been asleep it no longer transitions to a "Falling asleep" state for ~15 minutes before finally being "Asleep", it just goes straight from "Online" to "Asleep" in the space of a minute or so.
Haven't tested to see if it does this after a drive - as usually the car takes longer to go to sleep then.
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TeslaMate never recorded the "Falling asleep" state in the graphs, but you would normally see about 15 minutes of online time with the car actually being online for a couple of minutes after waking up, before "Falling asleep" for the remaining 13 minutes or so.