Volumio3 cuts playback on Spotify plugin, flawless with cifs network mount

I have an issue after migrating to volumio 3 (version as downloaded 2 days ago).
I believe this is not an issue listed on vilumio3 common issues.

I migrated because Spotify plugin could not connect anymore.
When playing from a cifs network source, playback is flawless (flag and mp3)
When playing using Spotify plugin, there are often times correlated when log shows something like:

level=debug msg=“fetched chunk 3/9, size: 524288”

Sound cuts and starts again. It doesn’t happen on all chunks, frequency of occurrence varies but generally around every 1-2 minutes.

This is specific from Spotify with volumio3 - on the 2 version when connection worked, playback was flawless.

I have a hifiberry dac+.
Network is WiFi - but cifs network share works flawlessly.

Any idea on how to diagnose / help root cause issue?

Thanks