I too have a 2020 Subaru
I too have a 2020 Subaru Legacy XT. Leased after reading Consumers Reports... My display also went black and had a very loud beeping sound that could not be turned off. This was at 70 MPH. I pulled off of the parkway to turn off the car and restart it. Immediately called the dealer and was told "Never heard of that before but if it happens again bring the car to service dept. Was at the dealer today for a different issue and inquired about the screen issues.. The reply was " you know that the is a computer with a harddrive behind the screen and the experience you had was a signal sent to the computer to update it....Dont believe him. At one time Consumer Reports had a policy of not allowing companies to use reviews from them to advertise products.. The Subaru dealership had reprints form Consumer Reports displayed all around the showroom. These were laminated and presented as from Consumer Reports.. It is difficult to believe this was done without Consumers Report. knowledge .. I will not be renewing my subscription.