Had this happen on my NA 850 over the past week in revy too with the cold. Only 2-3 times in 7 days of riding, luckily never in a bad spot. Once off break in did not happen...Buddy had a full day on the Boost today, coming off his modded Sidewinder. There were 2 Matrix Boost, stock turbo doo and a few stage 2 turbo doos. Believe all the new turbos were still in break in mode. But according to him he wasn't to impressed with the Boost, maybe used to the power of the Sidewinder, but expected more. Switched between the factory turbo Doo and Boost a few times and said felt the Doo was better/stronger, wasn't sure if it was the power, the delivery to the track or the tack itself. One complaint he did have was the intake inlet locations, I guess it was deep in Blue River today and the Boost intakes are on the side so would cause the sled to bog and starve for air.