In this case, logs show that initializing is continuing. There is no reason to stop the initialization other than to exit TuneBrowser or change the playback device.
An error in GetProtocolInfo means that the SOAP call has failed after SSDP has confirmed that the device is alive, so it is judged to be an error.
I understand your feeling that the error message is annoying, but I think the device is actually behaving strangely, and since other users may not be the ones looking at the logs as you are, TuneBrowser is notifying you of the situation.