you can fix it but the fix is never permanent. smartphone presence just isn’t as reliable as smartthings would like us to believe.
the "fix"es are in the links but it isn’t a one fix and you’re done, there are multiple things that you have to try to get presence working again.
try rebooting your hub and see if that works and if not try other ‘fixes’
the “fixes” are littered in the forum…that’s the way the cookie crumbles…
never ever let phone get below 20% at home or away lol this turns battery save mode and your presence will be all over the place…godspeed
I gave up on smartphone presense, I now use an arrival sensor with battery mod and leave it in my glove compartment.
Presence Sensor battery upgrade <—this has made a bigly difference.