Those three bars aren’t a great indicator of actual streaming, unfortunately, so I’d be looking at some sort of potential wifi interference which may be causing your speakers to drop off, and then at some point rejoin your network. The ‘update’ to the controller’s screen comes from the speakers, which are actually the device playing the music. If the speakers aren’t connected to your router at all times, they can fail to send the ‘this is the new song’ information to the controller. Frankly, the same applies to the device you’re running the controller on. If it’s not on the same subnet / WiFi as the speakers are, due to say a mesh connection, or a extender connection, the speakers might be temporarily able to send that update to the controller so it can display to you.