I just wanted to say that I am also a Spotify Premium subscriber using the Android (Pie) app and I don't have any issues with these two features. I cannot comment on the blocked songs, since I do not use that functionality. Have you checked the forums to see if other users are experiencing the same problems? Maybe there is a specific fix for your device.
The app is extremely unstable on Bluetooth as well, I now leave my expensive wireless earbuds at home because Spotify can't handle more than 10 seconds of continuous wireless playback without cutting out.