One problem related to engine noise has been reported for the 2018 Subaru Crosstrek. The most recently reported issues are listed below.
While driving on the highway, the engine just stopped and the entire vehicle turned off (computers and all). The cruise control was being turned off (from going about 75) because I was approaching traffic and it just turned off. Brakes still worked and I got on the shoulder. Then when trying to turn it back on, it would have very strange noise like an old fan or clunking. I would press my accelerator all the way down and it would only go 5 miles an hour. Finally after turning the car off an restarting enough times it ran normally. But then the computer was on the fritz. Flashing the high incline sign, the four wheel drive sign, and flashing all the cruise control. And the check engine light is on.