Yeah, happens to me too.
I have a bad snub mount and it likes to move around and set itself in different positions while I drive. Sometimes I'll come up to a light and I'll be like wow, the vibration went away! And the next light its vibrating me out of my seat and I have to shift to neutral to stop it lol. You could try getting a new snub mount and that MIGHT help, who knows. Couldn't imagine it's too bad with only 22k on it.