Having the same issue on my Linux Desktop installation (Premium Duo Plan).
No issues on Android smartphones so far. Sometimes app restart helps, sometimes doesn't.
Sometimes a particular track is not played at all, just the timeline shows progress but no sound. Another track is ok but returning to this one - same again.
This is very unlikely to be the problem with application, it's the streaming itself (the backend part). Otherwise it wouldn't be reproduced in so many different situations and hardware with similar sympthoms.
To me, the problem is of intermittent nature - no reliable way to reproduce it. It's in Ukraine.