the remote trigger on the M2 is just a timed delay. It does not sense when the system is ready to turn the amp on.
Could just be that the system takes a little bit longer to initialize the sound device from resume then it did before and now that timed trigger is too short. Windows systems do start to add crap as time goes on. Could just be coincidence and have nothing to do with the hard reset. You also say near the end of the resume sequence which sort of goes along with the "just taking longer to resume" theory. Try a disk defrag, clean the registry, delete unused crap, that sort of maintenance stuff.