Thank you for purchasing the S39C monitor. I am sorry that you're having trouble with stability of the stand. For further assistance, please contact Samsung Customer Support via:
1-800-SAMSUNG, available 8AM - 12AM EST (Mon-Fri) / 9AM - 11PM EST (Sat-Sun)
Samsung is committed to providing the best possible product experience, quality, and value, and we are always here to help with any of your questions or concerns.