I have a strange error that showed up 2 times for no reason recently. 123 spindle drive fault. Once on start up and once on accel to full RPM several weeks later. After I cleared the error the machine worked fine. Any ideas as to what is causing this. Another thing is when the machine brakes to 0 rpm it makes a "brakes squeeling sound" as I could best describe it. Could this problem be due to sticky grime in the belts and the error coming from wires that this grime got into at the connections? I replaced the power supply in september so that should rule out that issue.