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Hi Vincent, are you able to try from a different device just to confirm it's not just an issue between the pi and the phone. I use an android tablet and someone get delays before they see each other, but other devices connect ok.

Another possible issue could be interference so maybe change the channel in the /etc/hostapd.conf file from 6 to say to 3.
Let me know how you get on and i will look into it further.