On home network of six S4 devices working reliably, replaced main deco unit with this new X50
 

Result was problems with S4 units off line. Resolved by removing/adding deco devices.

But…internet responce for user devices (tablet etc) is sometime ok, but often slow/very slow/fail. 

Also max internet speed via deco devices is  ~50%  of main sky internet router which X50 connects to by Ethernet.

Must resolve or remove X50.

Help pls.