I have a R6400 set up as an access point. I have configured an EX3700 with Fastlane (5GHz link between R6400 and EX3700). Both R6400 and EX3700 are running latest firmwares.
When the EX3700 starts up, everything is fine, 780Mbps link with the AP, and connectivity is good. However, after a while (1-5 min), the router LED on the EX3700 is turned off and the EX3700 is disconnected from the AP. The AP is still fine (I can use it without any problem on the 2.4Ghz band).
