If you are not cutting does the router try to jump around?
Are you using the proper bit and not trying to over feed the bit?
Have you checked the router with a different bit? The bit may be out of balance or have a bent shaft. It doesn't take much to cause a lot of vibration.
Make sure you are not bottoming the bit out in the collet and that the collet and shaft are clean.
It might just be the router, not assembled properly or missing/defective parts during manufacturing.
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