Not staying charged

Battery life can vary based on what your doing with it. If you’ve started using more or different apps, that can be a factor. If you use features like GPS and Cellular a lot, that can part of it too. For more info on Apple Watch Series 4 battery life, see here: https://www.apple.com/watch/battery.html

For tips on maximizing battery life, see here: https://www.apple.com/batteries/maximizing-performance/

Reset your watch by pressing in the crown and side button until you see the Apple logo, then release both.