Watch Series 5 - bugs and misbehavior

Can someone please tell me what's wrong with (my) Apple Watch Series 5?

I got it for two month now and sometimes this watch gets me pretty upset cause of bugs and misbehavior.

(1) I often can't swipe up and down from the mainscreen. Swiping left or right does a proper job though. Rebooting the watch solves the issue- however that's an inappropriate solution.

(2) Followed by Bluetooth issues: I own two different non-Apple headphones. Both suffering from frequent connection dropouts. Again, rebooting the watch kind of solves the issue- and again, I say this is not a satisfying solution. Maybe you have another advice other than buying Apple EarPods?

(3) And finally some misbehavior around app:

(3.1) I can't get the Podcasts-app to just continue listening to podcasts, I previously listened on iPhone-app to. There is this icon to select listening devices, however, there is no option to select my Watch.

(3.2) Following, sometimes it just won't start to play. Watch is connected using cellular, iPhone is at home. Hitting the play button will fire a fading animation on the play-icon, but it won't do anything more.

(3.3) Same problem with Spotify-app as well by the way.

(3.4) On some apps there is this label on the top-left-corner which sometimes is a back-button and sometimes just a headline. Sometimes the back-button is indicated by a chevron- sometimes. Maybe there is an obvious difference, I'm unable to see?

Are you also having these kinds of issues with your watch? Maybe you got some advice on how to get around these problems?