Hi @qak,
A function called 'band steering' is by default enabled. This feature makes your devices connect to both 2.4Ghz and 5Ghz hence the possible drop with the connection.
You may try disabling this function and see how that works for your devices.
Just simply log in to your modem's admin page, select Wireless Settings (Advanced) then 'switch off Bad Steering'
Let us know should you require further assistance.
-Ahra_G
