I have 2 deco devices located at living room and 2nd floor outside Master bedroom each. First deco was connected wired with my router at living room. The second deco device is located at 2nd floor was connected wirelessly with first deco device at living room. 

My issue happen when my mobile connected with second deco device while im playing game on mobile. while im playing my game, My mobile will show connected with deco device but there is no internet connection halfway. I have to turn off mobile wifi and turn on again, internet connection will restore immediately after that. It will happen about 2 to 3 time in 20 minutes. 

I have no connection issue while connect with first deco device at living room throughout my 20 minutes game session. Reboot my second deco device few times and update firmware giving same result.