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I just wanted to update since this thread popped up again.
As I mentioned up thread, my '14 didn't lose anything. My '18 lost all the radio presets.
Radio presets are set per FOB. Did you swap FOBs or redo something in the FOB world? My wife's FOB has NO presets on the radio, whereas mine has 3 rows of presets for radio and NAV.
I wonder why our experiences differ. I have disconnected my 2018's battery a number of times with nothing lost. The radio presets, etc. are all maintained fine.