Check for the driver improperly operating the vehicle.

Correct the driver's operation of the vehicle as necessary.

Check for the improper clutch pedal play.

Adjust the clutch pedal play.

Check for the insufficient oil or the leak at oil pressure line.

Repair the leak or add the oil.

Check for a warped or worn clutch disc.

Replace the clutch disc.

Check for worn splines on the input shaft.

Repair or replace the splines on the input shaft.

Check for a weak diaphragm spring.

Replace the pressure plate.