I only just installed the GV app on Friday to test it with a new GV # before I switch from using Hangouts with my primary GV #s on my mobile devices.
I did NOT notice this on Friday or Saturday as I was checking the GV app out.
This morning, I DO notice that "Hangouts" flashes momentarily as you describe.
Do you have the beta VoIP functionality in your GV app yet? I don't yet.
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