My washing machine in my apartment is so darn nosy when it goes to spin it sounds like it is going to get up and walk out the washroom then it may be way I wash sometimes one thing. We have thin walls but you can hear that outside. The vent thing is near my neighbors front door next door I have lived here six years.
You need a new one. Your tub is off balence. If it continues your tub will develope a hole and leak.
some people don't have washing machines