Had something similar happen with my VS-300 a while back—solid blue light and totally unresponsive until I unplugged it. In my case, it turned out to be an overheating issue because it was tucked into a tight space with bad airflow. I moved it to a more open spot, and it’s been fine since. You might also want to check for a firmware update or reset; sometimes these things just bug out for no clear reason. If that doesn’t work, maybe it’s the power supply acting up.