Same issue! I didn't wear my apple watch for 2 weeks, and when I did charge it, I got this red screen that quickly faded to nothing. After leaving it charging for hours, it randomly showed a white apple logo, and then that red screen came up that quickly faded out again...I went through all the suggestions online:
- Check to make sure it was not on power mode
- Force reset by pressing both buttons for 10~20 seconds
- Check charging cable
- Charge through laptop, in case the adapter for charger was not working
- Clean charging cable and watch contact (with a lense cloth)
- Did not go in water or near water
- Never dropped it
I finally found this thread.
This is insane that this happens to many people, and the answer to this issue, is to just buy another one of their watches...the meaning of insanity, is to expect a different outcome if you keep doing the same thing!