2015 Subaru Legacy - flashing lights and trans trouble

Car runs okay then all lights flash and tranny doesnt work

First step is a read-out of the computer’s diagnostic codes. Ask your shop to do this. If you post the codes here you might get some more ideas. I don’t recall this being a common problem for Subies, something must be amiss w/your specific vehicle.

Subaru has extended the transmission warranty to 10 years/100,000 miles. If you are under the mileage limit, there is a chance this warranty applies.

MC-10117538-9999.pdf (nhtsa.gov)