Random hilarious related story: For a few days my media volume would be on MAX when I entered the car. Every single time. I was fed up and chalked it up to a software bug. Turns out, my 4 year old would unbuckle himself after I put the car in park, jump down and hit the volume + button...
FWIW, the instructions for the A2Z Typhoon Pro are to plug the adapter into the car first, then plug the charger into the adapter. I primarily use the A2Z and use the OEM as a backup.
A2Z Typhoon Pro Instructions
How the heck are you getting 55k on a set of the OEM 21"??? I drive pretty conservatively and my first set lasted 25k and my second set looks to be about the same. Is your regen setting low?
Rivians run their fans automatically after the car is parked and locked to dry the HVAC system's evaporator core. They also run fans to keep cabin temps from getting too high and damaging the screen.