I have never heard that "banging" is normal in shifting. We have talked about the "clunk" which usually appears after stopping and lifting off the brake. Many of us experienced banging (a harsh jerk) due to a mode switch going out.
A "bang" sounds too severe for regular shifting. It sounds like your service rep doesnt want to deal with a problem. I would take your VX to another service for a second opinion just to be safe.
;Dr;
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