On Thursday, November 28, 2019 at 12:55:40 AM UTC-8, Cursitor Doom wrote:

It's more likely a spike from the motor current being suddenly shut-off.
Remember motors are reactive components.

A normal refrigerator motor turn-off doesn't have this effect. This is
not normal, is most likely a wiring-in-the-walls fault. An electrician should
check the power delivered.