Start the machine in service mode by holding remote and function while powering on. Once it boots up, push the function button and then scroll up until you see the [HASHTAG]#Parameter[/HASHTAG] menu. Hit enter and then scroll down until you see the, Cut System Parameter menu. Hit enter and then scroll down until you see parameter # 37. Set that parameter to 0. Let the printer finish updating the parameter and then completely power down the machine by switching off the back power switch. Wait about a minute and then power back on in normal mode. The machine will turn on and re-calibrate the lock position automatically and that should fix your issue.