Not a word from developers after 20 days…
My yearly virtuoso account expires by november 25th and of course I’m going to cancel my subscription if I still cannot properly use what I payed for.
By the way: after a little time on Google I found that the issue is well known and documented and is caused by a misbehavior of MPD in addressing multiple requests to Qobuz and Tidal servers for tracks longer than its local buffer. The issue has been verified and tentatively solved by MPD and umpmdpcli developers introducing a configuration option which makes umpmdpcli act as a proxy for MPD and fully download every track before sending it to MPD.
The configuration switch that trigger this behavior is “plgproxymethod = proxy” in upmpdcli.conf and has been introduced in umpmdpcli since version 1.3.2 (2018-09-15).
From upmpdcli manual:
plgproxymethod: Decide if we proxy (copy: fetch/serve), or redirect the streaming services streams. Using redirect is much more efficient, but the proxy has a facility to retry when a stream is dropped by the service, which seems to happen esp. with Qobuz.
Unfortunately this solution does not work with Volumio because it still uses an outdated version. I tried to install a newer one using lesbonscomptes own repository but to no avail, because of further unresolved dependencies.
Further references (among many others from a simple Google search):