I'm gonna take it in to the dealer. I have have several race cars and I've owned a long list of performance street cars including 911s, M3s, etc. I've never had this problem so I don't think it is driver error. If I shift really slow it does not happen. But I'm not used to shifting in slow motion. Shifting very quickly, but precisely and smoothly is a skill I've been working on for years. Every fraction of a second your car is not under power is lost time.

I think it must be the syncros.