I changed the DNS servers as directed using my router’s setup utility, which is much easier than going through Windows Control Panel, and so far so good, in other words 192kHz files from Qobuz are now playing correctly and are back to being gapless. I don’t understand why but that’s why you are an IT professional and I’m not 
If I encounter any problems I will follow your other suggestions in the order you suggest and see if that resolves the problem.
Thank you for your help. Have a safe and Happy New Year!!