Buzzing sounds when I switch off the electrical socket
Is it fine to hear buzzing sounds when switching off power points?


It suggests something is plugged in and turned on (drawing current) and that maybe the switch contacts are not clean or are pitted.

The buzzing sound is probably arcing as the switch breaks the current. Its a sign of further damage accumulating. 

New sockets are cheap enough (less than two cups of coffee) that you could try replacing one and see what effect it has.

At a minimum I would turn the circuit off at the breaker and open up the socket to looks for signs of overheating.