I just purchased the powermatic 2x4 cnc router. I got it up and running perfectly. This morning however when i turned it on the inverter screen was flashing F11. Everything functioned completely normal except the spindle wouldn't turn. I tinkered with stuff and got in running, but the spindle would stop mid run and the same code F11 would be flashing again. This is really bad because everything else was still moving. I'm guessing this could seriously damage the machine. Any thoughts of how to fix this issue.