I'm having the same issues with my MPVI2. I'ts hit and miss on whether it connects at all and when it does it will usually cut the data feed and produce me with a useless log. It has also cut out during a calibrations change and left me sitting a hour away from home until i could get the thing to reconnect, luckily it was just a calibration change and not a full write.
Edit, I also just reinstalled MPVI2 drivers so i will see shortly.