Hey!
Maybe I can find someone here who has the same problem. A week after I installed WatchOS 3 beta my Watch stopped charging. If I put it on the charger from Apple simply nothing happens. I tried rebooting, hard resetting, plugging it into my Macbook and still nothing happens. Even the charger runs hot when I put my Watch on it.
Now my Watch will run out of battery soon and I can't try anything else. I hope someone has/had the same problem and found a solution because this is really annoying and since you can't downgrade anything I will have to send it to Apple.
Thanks!