.For replacement , you need to call Samsung, the hotline is indicated in this link: https://www.samsung.com/us/support/contact/. The number is going to be listed on that link, call that number and speak to a representative. Please be sure to have the proof of purchase handy because you will have to submit that. They will provide you with a UPS shipping label and will give you all of the instructions
I am sorry you have tried all the troubleshooting steps to get this issue solved with your watch and the problem is still re-occurring. It sounds like a hardware issue.
My suggestion is to call 1800-SAMSUNG (1800-726-7864). Once you call them, try to reach a representative and have the valid proof of purchase handy and the serial number of the device. Let them know you want to mail in the watch for service and they will email you a UPS shipping label and give you the proper instructions on how to do this process. It typically takes 7-14 business days for you to receive them back. The serial number and the proof of purchase is typically what is needed as long as the device was purchased less than a year ago. If it has been more than a year, there may be an out of warranty charge and this will all be explained in the phone call.
If you have any questions, please let us know.