Hi @qobuz_lap, welcome to the community.
As a first step, please check the discussion here: recent issue, not sure if it’s DAC. In that thread, we also mention switching to the beta channel, which has reportedly avoided the problem for some users.
On the subscription side, plan changes are handled separately from technical support by the accounts team. If you’d like, we can move that part of the request into a private message so it can be handled appropriately.
If the article or beta channel does not resolve the playback issue on your setup, reply with your current Roon Server platform and the exact behavior you see when a 24-bit stream is selected, and we’ll take it from there.