Audio Pro speaker is not showing in connectable devices

[permagnus]

Plan

Premium

Country

Sweden

Oneplus 7 pro, LG gpad

Operating System

(Android Oreo, Android Kitkat)

My Question or Issue

Audio Pro C10 speaker with Spotify Connect is not in the list of connectable devices.

I have an Audio pro C10 with Spotify Connect. Sometimes it does not display the list of connectable devices. I have tried to restart everything (many times). I've also tried to reset the router, app and the whole speaker but nothing helps. Today it has not been shown all day. The last time I had the problem it had suddenly come back the next day. I have other devices on the network and these are shown without problems (Chromecast, PS4 and Chromecast Audio). In the Audio pro app everything looks normal. 

I also have an iPhone at home. In that app the speaker is displayed without any problems. 

Please help me. This is driving me crazy.