My screen toggles automatically
How do I fix a screen that toggles automatically due to water damage?
if you know its water damage you will have to open the watch and try to clean out any corrosion you can find with the highest percentage rubbing alcohol you can find. and hope that none of the tiny components are damaged. if they are you may have to take it to a shop to be fixed. unless you want to do it your self?
i know ifixit offers some good repairs kits to assist in opening devices