Temperature causes door handle lock and no start problems

[Packerz1967]

I have a 2019 G70 Prestige 2.0T. When I park, lock and leave car in bright sun/very hot day, the drivers side door handle button will not unlock. The lock activated side mirror fold does not function ( fold back outward. Also, car won’t start with brake pressed and start button pushed. I have to use fob button to unlock drivers door or just use passenger side door handle button to unlock/entry….but car will still not start normally and requires the “apply brake and push start button with fob method”. I know this would indicate a possible low key fob battery condition but both fobs have been used and batteries in both replaced twice. I was told that the critical sensor that controls door handle lock button, mirror fold/unfold and start is controlled by the sensor located in roof area above headliner and above visor on drivers side. Has anyone ever experienced this scenario? Is this covered under any type of warranty (car has less than 31,000 miles!
What is the name of this controlling sensor? Real expensive item to replace???? I can’t figure this out! Totally weird problem…
Help!!!
Doug in Asheville, NC. Closest Genesis dealer is now in Greenville SC…. Thanks for any/all help!