Hello provoste,
I read your post about your Porsche GT4 transmission failure on 3rd gear by shifting from 2nd to 3rd at Mid Ohio.
I have Porsche GT4 as well and I took delivery in April of 2016 and I had the exact same issue. It happened to me in July, replaced transmission and In September in happened again the exact same way.
Did Porsche cover your transmission replacement under the warranty ?
Did you had this issue again ?
I'm really curious to learn about those things as I think something is wrong with those transmissions.
I would really appreciate your input on this.
Cheers,
Mike