SUCCESS!!! Hope it lasts... 😉
I surmised this might be a flash issue with the latest mac-os update to Catalina 10.15.4 after seeing FLASH icon appearing between every re-sign on. So I unistalled flash and reinstalled the latest version (selected by my mac), and it worked! No more closing of the xfinity streaming app, I can now move seamlessly between streaming and other websites and back!
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