Since the latest update I've noticed the battery life on my Watch 4 Classic has reduced by a substantial amount. This isn't uncommon but in this case I've found that when I check on running apps, Samsung Health and/or Music are running in the background. I don't use either of these apps and no matter how many times I stop them they reappear.
Since the update, on all watches things have been running in the background and you aren't able to force them to stop, I have the same issue with the health app, guess we all just have to wait for Samsung to sort themselves out hey ?