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.