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Shimano Di2 issue

I have shimano Di2 2017 with D-Fly, so I connected it with my 820.
I dont knon why every minute 820 display the message "SETUP Di2 BUTTONS? " even if I've done setup for all buttons and they are working well.
I tried to delete sensor and setup again, but no change.
It's really annoying...
Any suggestions? thanks
Stefano