Just came across this thread and thought it would be interesting to you guys to know that NCCR in Sweden has figured out the cause of these engine failures.

It's chassis flex with the engine being a stressed member.

And they have a youtube video that is very good at explaining it.

They developed a billet aluminum kit to brace the frame, costs $1000 or so depending on options. Not cheap, but neither is CNC machining or replacing engines in these. I'll be getting one for my RS Carbon very soon.