Basic info: spotify premium, Samsung S10, Samsung S20, Oneplus 8T. Forum has been browsed through, no help there. Router, switch, WiFi turned on and off multiple times, reseted twice. Spotify app reinstalled multiple times on all mobile devices, with different combinations of wifi being on/off, music playing/not playing and so on during the extensive troubleshooting session. I have three speakers at home (2 x google nest mini grouped into one (lets call it bedroom), 2 x sonos symfonisk grouped into one (office), 1 x Denon connected to an array of speakers as the living room main audio system.)

My problem is this: all of a sudden (about 4 days ago) spotify connect stopped working on all mobile devices. Here are the findings and conditions when things work/do not work:
1) Initiate a song from android, connect to any of my home speakers -> can't connect to any device, music keeps playing from the phone it was initiated from
2) Initiate a song from desktop/laptop, connect to any of my home speakers -> works normally. Mobile devices can switch both song playing and device being used without any issue.
3) Initiate a song from mobile device, use desktop to select device -> works normally

So, if I don't have my desktop/laptop running (usually not) I am unable to use Spotify connect at all and frankly it's very frustrating as my whole home theater/audio setup is now practically useless (99% of my use is spotify music/podcasts). All help appreciated but please read what I wrote in the beginning of this post - troubleshooting the basic stuff I believe has already been done.