2) Sure they have. Examples at
BMW owners across the country are asking how their parked car could catch fire.
abcnews.go.com
There are new questions surrounding mystery fires involving some BMW's and Mini Coopers; both made by automaker BMW. The ABC 7 I-Team and ABC News are uncovering new cases of parked car fires, without fire-related recalls.
abc7chicago.com
As mysterious BMW fires continue, calls for investigation into possible causes grow (from Feb 5, 2019):
"The luxury automaker wasn't the only vehicle producer to take that step. Car manufacturers collectively have issued 62 parked-car-fire-related recalls since 2017. Just last month, for example, Hyundai and Kia recalled 168,000 vehicles for fire risk."
Ford Cruise Control Deactivation Switch Recalls and History - search this multiple times for
parked
As Hurricane Nicole was bearing down on the state, an Ocala couple’s home was burning, driving them, a house guest and two tenants out into the street.
www.wesh.com
If you own one of these cars, vans or SUVs, don’t park them in a garage, automaker says
"Two weeks ago, Hyundai and Kia alerted the U.S. National Highway Traffic Safety Administration about a rare but dangerous defect discovered in 10 Hyundai Elantras that caught fire while parked and off.
...
In September 2018, Heriberto Vega’s black 2008 Kia Sorrento also mysteriously caught fire while parked inside his garage in Palm Bay."
Five cars rented by Secret Service for Biden vacation catch fire, are destroyed which points to
https://www.ford.com/support/how-to.../ford-expedition-recall-battery-junction-box/.
Ford, Lincoln Recall 198,000 Expedition and Navigator SUVs for Fire Risk refers to this recall and another one.
3)
https://www.nfpa.org/-/media/Files/...nd-reports/US-Fire-Problem/osvehiclefires.pdf page 2 has some stats. If you go by 181,500 highway vehicle fires in the US in 2018, that works out to about 497 fires per day.