Missing most Denon HEOS devices on my network

[myMarck]

I began with 1 Denon HEOS speaker - and everthing worked fine...I was always able to connect from Spotify on computer,android and iphone.

I have slowly got more and more HEOS speakers (think I have 10 now) and now it works teriberly. Right now I am only able to see 1 speaker pair in the Spotify app (I can see and use all the other speakers in the HEOS app) so it has something to do with the integration between HEOS and spotify. I have tried to open a support case with Denon HEOS but they say it must be a Spotify problem since I am able to use the speakers inside the HEOS app.

I have tried to reboot my network devices, speakers and reinstall Spotify on all devices without much luck.

One "funny" observation. If I group one of the speakers I can not see/connect to in the Spotify app with the one speaker pair I can see then suddenly I can see (and play music on it) from inside Spotify. If I disolve the group then it is hidden once again.

Any idea welcome!