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I have done some more experiments since my last reply and I am happy that the K5 is doing all of the fundamental things that it should be doing correctly. The app, however, is struggling a bit. It will play downloaded files reliably and the phase shift between the picture and the sound has not occurred on that mode of operation. But every time I try to play a file from the camera storage, it fails and the app either shuts down completely or returns to the top-level menu.
I do have an active anti-virus app on the phone. I also have another phone but it does not support 5GHz wi-fi. I have loaded the app onto it and run the same tests as before, after switching the wi-fi band. The results were similar but not quite the same as the other phone. It played the downloaded files OK. And it started to play one of the files from the K5 but it then displayed a message to say that the file is a 4K file and it would give better results if it were downloaded. On subsequent attempts, the message came up immediately and the file would not play at all.