Join meetup button flashes up only briefly

Just done a ride that was a friend’s meetup set for Makuri Islands tonight. I use iPad for main screen and iPhone for companion. When warming up, 10 mins before meetup time, the “Join meetup “ button would only flash up for less than a second about every 15 seconds. Usually it stays on screen till you join. Only way I could join the meetup was to hover my finger over where the button appears and try to press it in the brief moment it appeared. Had no problems joining a similar group ride on Tuesday.

I have observed this as well. Not all the thim a bit random for me. A friend said he see it regularly. The best is to wait for the 5 min banner.