.

Regarding your bug 3: my watch shows the morning report one hour before the sleep schedule ends. And I can’t swipe it away, then it asks me to wake up. And if I tap ‘no’ then it goes back to the morning report including the backlight. So the only way to turn of the screen back light again is to tap ‘yes’ (I want to wake up) and then the backlight can be turned off. But I have read it’s normal that the morning report shows up one hour before your scheduled wake up time. Only it just shows up too when you didn’t touch the screen. So when you don’t notice the battery drains.. (when you’re still sleeping). 
And my morning report doesn’t show the weather anymore and it’s not showing the beautiful weather background either. I’ve read that people with other watches also experience this (venu 3, on Reddit there is a whole thread). 

I don’t have bug 2. But my watch screen is opening things on its own (my sleeve does) and that’s draining my battery too I think. Because battery life took a big hit since the latest update. When I was driving and listening to Spotify in my car via the watch, my sleeve slipped songs constantly. 

Bug 4 I have never encountered either. 

I do have problems with the optical HR sensor though. Since the update. I have a lot of flat lines in my hr graph and sometimes when I look at my hr on my watch it just stays the same (85 for example) for over 5 minutes. So that’s really annoying. It never did this before updating. My pulse ox finger meter is measuring correctly, the numbers change from 85 to 84 and 87 etc within those 5 minutes and the watch just displays 85 for 5 minutes. Can’t be right.