@nmnsnghl 

Hello, thanks for reporting.

Generally, the router will determine which band is best for the device to use when Smart Connect is enabled, while we don't think this is actually a bug. There are differing implementations of Smart Connect, some do 'load leveling', that is all radios (dual-band or Tri-band radio's depending on router as well as the guest radio's) will get an even number of devices connected. Some just determine the best radio for the device and will connect to that leaving some radio's having more devices connected than others. Some implementations will also dynamically level the number of devices connected to the radios. If you find your devices are connected to the 2.4GHz instead of 5GHz when Smart Connect is enabled, you are suggested to disable it and connect to the 5GHz manually.

Good day.