Differential Unit problems of the 2015 Subaru Outback

While driving down freeway at 75 mph, transmission made two clunking sounds, and speed decreased - rpms increased. We could smell oil burning smell, but no smoke or leaks. We were approximately 12 miles outside of las vegas and 22 miles into our trip. There was no warning and no decrease in speed or other signs prior to the clunks/clanks. Vehicle towed to Subaru of las vegas. First Subaru tried to say rear differential caused. Please see dan's driveline invoice. Next they tried to say front differential caused. I challenged - how can a functioning differential cause a transmission to become toast? next step is Subaru hq tech to tear down transmission. I've included documents from auto lab (did 30k mile service), Subaru invoice, Subaru email saying front differential caused,.

The transmission has been leaking since we purchased the car in Jan 2015. One dealer told us there was no leak and finally decided it was the right differential and repaired that. The transmission still leaked. Took it back to dealer where bought, they found leak and said it was repaired but it is still dripping. Plan on taking it back to them next week. We keep clean cardboard under the area where the leak is to protect the garage floor and document the leak. Last repair July 25 of 2017.