We are having a problem with our 6030. The operator adjusts the cold start position on startup. The machine runs fine and makes tool changes for the first 10 to 15 minutes. when we start having trouble is on a tool change. the tool carousel will hit the tool and jam up. the z axis seems to settle downward after a few minutes of running. we can rehome the machine and start over, it will run ok for a few minutes and jam again. does the z axis motor have a motor brake?:violin: if not what could cause the z axis to inch down on it's own?