Thank you for reaching out. I can certainly understand how frustrating it can be when the buttons on your watch are not functioning as intended. Button malfunctions on your watch can be caused by physical damage or software issues. However, clean the buttons if there's build up of foreign material like lotion preventing them from properly working. Give this link a try: https://www.samsung.com/us/support/troubleshooting/TSG01003250/
If you have tried the troubleshooting steps provided and are still experiencing these symptoms the next step would be a service repair.
In warranty service repair: Please feel free to reach out to us directly via one of the following options and include a link to this thread.
1. Facebook Messenger: http://m.me/samsungsupport
5. Contact our customer service team directly at 1-800-726-7864
Out of warranty repairs: Please contact our customer service team directly at 1-800-726-7864 to discuss to the best options to resolve the symptoms you are experiencing.
For international devices: Please use think link to contact the local support team in your area: https://www.samsung.com/us/common/visitlocationsite.html