I also own a 2017 Subaru
I also own a 2017 Subaru Forester and have had the same issues with the screen going totally black or being frozen and totally non-functional. I have brought it to the dealership twice because several people have informed me that they cannot understand me with Bluetooth calls. I have had the radio freeze where I can't shut it off or adjust the volume and have not been able to use my GPS through the speakers, or make or receive calls or texts. It's been an awful mess. The dealership keeps saying it's fine. Very frustrating. First and last Subaru for me as well.