Could be something loose on the magnet assembly. It is quite normal in my opinion however. Usually they fire the magnets at high power first to grab the ball, then lower it. The first couple seconds can make some more noise.

Mine buzzes but only a few seconds. Then it comes down the ramp toward the left flipper..wire ramp

Yes I have owned 2 No fears and both buzz when passing the optos. it will send the ball back down the left when that happens. It depends on the mode some modes clear the gate but if it buzzes and still clears the optos that means your magnets are not strong enough . the buzz means it should come back down the left side and a few modes cause that to happen. let me know if you have any questions.

Mine doesn't buzz on a normal launch up the ramp. It will buzz in the modes where it stops the ball for the shot from the left flipper( then it drops the ball into the ramp to the left inlane). iirc its the nascar mode and the Glenn Plake mode.

Bob

My left magnet would buzz and hold the ball until the machine timed out. Then I blew fuse 103 shortly after, not sure if related.