I have been observing this problem with OH 2.x for quite some time. I assign a fixed IP address for my Chromecasts and the port for the audio group changes from time to time. It is not understandable for me.
Apps like BubbleUPnP, Audials or PowerAmp have no problem to work with the changed port of the Chromecast audio group. This is a very very annoying thing …
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