Stop the microwave using the Pause/Clear button rather than just opening the door while it is running. This will prevent this switch breaking contact while conducting current and make it last much longer.
LONYE kw3a switch(normally close) specification:
Temperature: 10T105
Insulation Strength: 100MΩ Min
Test Voltage: AC1000V/2000V
Contact Resistance: 30MΩ Max
Operating Force: 2N Max
Release Force: 0.5N Min
Operating Position: 14.9±0.4mm
Movement Differential: 0.4mm Max
Electronical Life: 50000 Min
LONYE kw3a switch(normally open) specification:
Insulation Strength: 100MΩ Min
Test Voltage: AC1000V/2000V
Contact Resistance: 50MΩ Max
Operating Force: 2N Max
Release Force: 0.5N Min
Operating Position: 14.9±0.4mm
Movement Differential: 0.4mm Max