Try to spray some silicone into the seams between the different components.
13 Legacy I just bought has the dreaded shift lock solenoid click too. Didn't even give me 1000 miles of peace before it showed up. Beyond frustrating. How does Subaru not fix this?I not only hear that stupid click every time I stop the car, but can feel it through the shifter. Again, dealer says "normal". But it is incredibly annoying.