[Quartermile]

I’ve had my SCT tune loaded on my 2011SS for about 5 months now. Although I do have a custom dyno tune, the tune I use all the time is basically the stock shift points with the AFM delete. All was fine up to a few days ago. I always drive in “M” mode without using tap shift. While merging onto the highway I would say between 4th and 5th gear my RPM’s shot way up and I was going nowhere fast! I panicked and through it into “D” and it caught the gear. I’ve put on at least 40 miles since then and it has not duplicated. From the research I’ve done this is common after tunes for the L99’s. But I don’t see how flaring (aka) slipping can be common. Is my tranny shot after 6K miles??