Sunlight screws with mine more than any other variable. If the sun comes through the side only lighting up one side of my face it will disable every time.
As a general rule I now turn off my DMS every time I see it default to ON. I'm convinced the system as of 2022MY was not ready for prime time, not refined enough. If I could disable it without a warning light on the dash I would.

 

That’s been my experience with my 2020 Legacy XT. The system disables itself at least half the time. I would love to permanently shut it off; I used to turn both auto stop start and the DMS off each time I started the car, now I just ignore the DMS system and turn off ASS each time.

 

The pesky DMS is working so much better now, not perfect but better. I traveled to Las Cruces NM last week with no DMS problem. On the return trip to Albuquerque the next morning, about two hours into the drive, a sun ray shone directly on the “bar” above the Infotainment screen and immediately the DMS disabled. After a stop in town, the DMS switched back on and hasn’t disabled once.

 

For folks who have their system disabling, are your windows tinted? (drivers and passenger side, in particular) - I haven't had any issues thus far with mine disabling - my windows are tinted at 20% all around (done by the dealer before I bought the car - they do most of their cars, it seems) - not advocating for window tint, just curious if it's a factor. (tint is very nice to have in the desert southwest, that's for sure!)

 

No tint on mine, but it rarely self-disables on overcast, cloudy days.

 

Greetings. It was suggested by a tech guy at my Subaru dealership to create a separate profile scanning myself also wearing sunglasses. So far the DMS has not disabled itself.
He has a client who created three different DMS profiles with eyeglasses, sunglasses, and his cowboy hat.
I may also have the driver and passenger windows tinted too.

 

Please tell me someone has found a way to permanently disable it!

 

I cut out a piece of black vinyl tape to cover the driver monitoring system. It works great /matches the dash and is permanently off for the last year. Also, “the man” can’t hack my car anymore and watch me pick my nose.