Never had this one happen before.
A couple of years ago I was fitted for my current gamer. Ended up with an LTDx Max, Motore F3 6R shaft, +1 setting. I recently noticed a significant drop in total distance and my ball was falling out of the air and not carrying "out" like before. Cobra van was here yesterday and when I got the notice I signed up immediately.
Long story short, my spin numbers had jumped way up and I ended up moving to the LIN-Q Blue 7F4. Not only stiffer, but heavier as well. What surprised me was I added 4 MPH swing speed on the Trackman with this shaft. All my numbers moved back in line and my ball flight was back to the more penetrating flight I was looking for.
The only other thing I was really pleased with was that I kept my swing and swing speed consistent throughout the session, even in the heat and humidity. Leave it to me to schedule mine at 1 pm when its 92* and no clouds.