When R850 upgrade to Unleashed 200.18.7.1.302 from 200.17.7.0.152. then some 2.4G smart home device will be officeline (2.4G & 5G is same SSID, and with 30+ smart home deivce, Most of them are 2.4G devices.) . If downgrade to version 200.17.7.0.152, ...