Has anyone experienced their ctalyst convertor, transmission and engine going all within 6 weeks of each other?

Acceleration was compromised so I brought it to the Subaru dealership.  Car has 149k miles.  They told me it was the OSV Valves, replaced them *$700 later.  Still experienced the same issue, they diagnosed as the transmission; SOA did pick up the cost of replacing it.  Picked up the car, and the car within two miles of driving it off the lot, started to shake with the dashboard lights all going on.  They failed to fix the car this second time around.  Brought it back only to be told that the one of the pistons was filled with oil and now I will need a new engine.  Asking SOA to replace it at no cost.  How can all three major parts go at once.  I bought the car brand new and have been diligent and caring for the car.  I am outraged at a six year old car experiencing all of this.  My family has a 2011 Kia and 2004 Volvo and no major issues at all.

What is going on with Subaru?