Been testing some more, I noticed I only get failed exposures if I have my guide camera & PHD running. I have a ASI 174.
Doesn't matter if I have both plugged into the PPB Advance or to separate USB ports on the laptop.
If both are plugged into the PPB, but I am not using PHD/guide camera... the 2400MC runs perfectly. Soon as I connect the guide camera to PHD, whether I'm guiding or not... the 2400 fails all exposures that I attempt.
Also I am having issues with calibration in PHD all of a sudden. Not sure how or if this is even related.