I am riding a 2016 Freewheeler, stock except for a MS fairing. It is kept on a battery tender between rides (I am a weekend only rider).
I usually keep the digital display set on gear/rpm and it used to stay there between shutting down and re-starting.
Just recently I have noticed that between starts it defaults back to odometer.
I have had similar things with car radios losing their station memories due to a weak battery.
Is that it?