NOTE: Most of these numbers are guesses because the problem isn't repeatable and has been observed at random.
Sometimes I go to pass someone around 55mph and give it enough gas to get boost and a downshift but not just stomping the gas, I reach 75mph or so near the upper RPM range and it feels like it's mis-fireing, but not... More like the rev limiter is hit and it's cutting out.
I usually drive to work with all gauges turned off and only using the HUD. Monday I went t work at noon so I got to see the gauges when it occurred. When it did it, I noticed I was only at 4500rpm.
I can HEAR the supercharger whine skipping when this happens, and that is the only real symptom I can actually note, but boost cutting on and off is a scary feeling. When it does it, I always let off gas right away though.
64k miles, likely original belt, stock engine except open cone. Been 25F-35F lately.