Intermittent audio streaming during activity or using widgets

Hello,

Recently I bought Garmin Venu and I really enjoy it. The only thing which is very annoying and makes it impossible to leave phone at home while running etc is audio streaming.

I have uploaded few playlists via Spotify app to my watch and connected Mi Earbuds via BT. When I am just listening to music while sitting or walking everything is quite fine but when I am trying to  use the widgets or doing some activities like running music is very intermittent. Basically it is impossible to listen to it. Looks like the watch's CPU is somehow overloaded which is causing such behavior with BT transmission. 

Does anyone encountered similar behavior and maybe know how to fix it?

Second issue is that while I am connecting the speakers volume is set to maximum as default which literally might blow my ears...