Watch won’t stay on
I can see the apple icon briefly but then it quickly disappears
Question marked as
First, try these steps:
If your Apple Watch won't charge or it won't turn on - Apple Support
Then see the replies to:
My apple watch flashes the apple logo and… - Apple Community
My Apple Watch just stay on the apple log… - Apple Community
Your best option may be to make an appointment at the Genius Bar in an Apple Store near you and let them look at it:
Genius Bar Reservation and Apple Support Options - Apple