I think this was like OG major complaint with the Apple Watch. The watch face wont stay on and I really think its Apple's (and just about every tech company now) problems with battery life/stability on their devices is a little quirky. I also remember in the tear downs that the amount adhesives being used to compile and waterproof the watches is an issue as it relates to heat. All that being said i am fairly sure you can tune how long the face will stay on before sleeping (really seems to be a max of 1min 10 secs) and also how long an app will stay active when the watch does sleep. Until new OS idk of any thing else but I'd be curious to know myself