Thanks BubbaHyde, appreciate your prompt response, and advice.As far as the dropouts go be sure that your Tidal app is updated to latest version it helps.
Tidal had always been a bugger but it does work flawlessly for many , but there have been issues.
So do your hard reset as per the first post, even if you did try it again don't worry about wifi hotspots anything until it's working fully wired first, I know...PIA but worth it.
Also off you want try the ZS with coax to your Gustard see if itt responds inn the same way.
Also make sure your firmware is up to date as possible, I did have a Gustard and never had issues, but my reset procedure has helped greatly in the Tidal area,
Also off you are using a 9v power supply, not sure what you got with it, please try another 9-15v power supply if you have one. It may solve the issues.
Hope this helps!
Cheers!!
I believe the Gustard is running the latest FW, but I'll double check. I'll also try coaxial and see if the issue re-occurs (awesome hint thanks).
Both Tidal app on my phone are the latest (desktop app auto updates), but yeah great advice as an out of date app can cause issues for sure.
The issue still occurs with my LPS (a Teradek Dual LPS - 12V/8A), and I checked the adapter that came with it, and its a generic 12V/1A one.
Not keen to drop more cash on another PS/adapter in case it's the ZS itself, so I'll see what iFi advise once I hear from them.
Thanks again, and I'll post back here my findings/updates in case it helps anyone else out.