There are many possible reasons for rapid positioning lag, and the following are some possible reasons and solutions:

Insufficient stiffness of the machine tool: If the stiffness of the machine tool is insufficient, when quickly positioning to the target position, the machine tool may vibrate or deform, resulting in jamming. The solution is to adjust the stiffness of the machine tool or use a more suitable machine tool for processing.

Servo system issue: During rapid positioning, the servo system may experience issues such as position deviation, unstable speed, etc., resulting in jamming. The solution is to check the servo system and repair or replace faulty components.

Control system issues: The control system may experience malfunctions, such as program errors, insufficient memory, etc., resulting in stuttering. The solution is to inspect the control system, repair or replace faulty components, and ensure that the program is correct and error free.

Tool wear or damage: If the tool is worn or damaged, it may cause jamming during machining. The solution is to replace the tool and ensure that the quality of the tool is qualified.

Improper setting of processing parameters: If the processing parameters are not set properly, such as excessively high feed speed, cutting depth, etc., it may cause jamming. The solution is to adjust the processing parameters based on the processing materials and requirements.

Please note that the above are only some possible causes and solutions, and specific problems need to be analyzed and resolved based on the specific situation. If you are unable to solve the problem, please seek professional assistance.