My Galaxy Watch 42mm Rose Gold (SM-R810) had good battery life until the most recent update (Feb 2020). Since the update, I've had to disable nearly every function that makes it a smart watch and the watch still prompts me to switch to power saving mode by 1700.
My most recent attempt at saving battery life is to keep it in power saving mode. That doesn't work either. It gives me another few hours, at best. If I'm lucky, it remains on until 2100.
Prior to the update, I was happy with my watch. Now, I'm debating getting rid of it.
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 battery/hardware issue based on the symptoms you've described.
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. Try to be as specific in the phone call and be aware that they will ask you for a shipping address.
If you have any questions, please let us know.
Okay sounds like you need to get device inspected and repaired . For repair, here is the link: https://www.samsung.com/us/support/contact/. You can get info on where to go to service or contact to ship out the device for service