What is the reason why the perpetual calendar of Ziweixing advanced computer is getting slower every day?

The perpetual calendar time of Ziweixing advanced computer is getting slower day by day, indicating that there is something wrong with the circuit board of the computer digital perpetual calendar movement, or the crystal oscillator does not match the 27pF capacitor, which can be repaired by general electrical repair shops.

But you'd better go back to the original factory. After all, this situation will be caused by other reasons, and the general repair shop may not be able to repair it.