@Chau_Nguyen Thanks for the information provided. May I know what is the current network diagram? Except for the iOS devices, what about the upload/download speed you can get on your Android devices?...

@Badger Hi, we will get some details to do further analysis and try to fix it. 1. What is the current network topology/layout? And may I know who is your internet service provider? 2. With your...

@Reverb Hi, please check the hardware version and firmware of the third Deco M9 Plus you bought. It seems that it is V2 because the Deco M9 plus V2 does not support some features which have been...

@ribrob The hardware version is printed on the back panel of the actual device. Below is the instruction: https://www.tp-link.com/support/faq/46/ As for the speed issue, we need do more...

@Exo3 Hi Tom, we can do some troubleshooting first to locate this issue and try to figure it out. 1. How far away between the Deco units? Try to move them closer and test the speed. With the 2 slave...

@AlexLJones Hi Alex, what about other devices? Can they access internet when the Sonos shows offline? Please check the IP address and gateway of these Sonos devices when they say offline and try to...