Play freeze is this a bug?

I often cut and paste sounds from a template file into a file I am editing. I have the two files open and toggle between the two.
Having just downloaded the latest version of Audacity onto a new Windows 10 PC, I am finding that “Play” is freezing when I switch between the files.
I have to close the affected file and reopen it to get it to play again. Very frustrating! Any thoughts please?