What is the problem of unstable pressure of the four-column cutting machine

Question: 

The pressure of the four-post cutting machine is unstable. Sometimes the pressure is normal and the material can be cut very well, and sometimes the pressure is very deep. How to solve the problem of die-cutting the knife into the cutting board?

Answer: 

If you encounter this problem, you need to check small relays, time relays and solenoid valves