I do not know what you mean by changing the channel. Below is the settings my router is currently running on. What should I change?

Wireless Mode: Auto

Control Channel: Auto

Channel Bandwidth: 20/40 MHz

Extension Channel: Auto

Also it says I have two different types of frequencies which are the 2.4GHz and 5GHz. If I change the settings in one frequency, should I change the other one as well? Since I did put the same network name for both frequencies, it only shows up as one network.

So try changing the channel bandwidth from 20/40 MHz to 20 MHz. Also try to change wireless mode and control channel as well. Do reply with the findings.