I keep fighting for 20mn everytime I want to use my F1 … 
Disconnect USB cable, 
Change USB Cable

Change USB Port … 
Turn on/off device
restart XCS… 

Until it finally connects ! 

But this time I spent more than 1 hour and XCS keep saying “Connection failed, verify USB cable blabla …” 

The device is new (7 days old), this is unbelievable :(