Hi there and welcome
Can you tell me the make and model of your wifi router please?
this modem has no bandwidth management but most games do not need 16MB, so looks like its the actual wifi interference.
What is it they are connecting there to wifi?
ok, its not about dedicating bandwidth then, there is an issue somewhere
remove the power to the wifi router, wait 5 minutes, connect the power and tell me how it then functions please.
yes we can