ASUS K52F Laptop: Windows 7 Home Premium 64 bit with latest 'important' updates
Cable modem: ARRIS SBG-6700AC
Cable provider: COX
Connecting to Internet with 5GHz band works fine all the time. But if I use the 2.4GHZ band, the internet connection after a few minutes will be either quite slow or be lost. I then switch to the 5GHz band and all is fine. I only have one wireless device, the laptop, which is 5 feet from the cable modem. I am on the top floor of a condo. There are 12 other modems from other residents that I see when I click on the Windows internet icon.
2.4GHz band = b/g/n, bandwidth = 20 MHz
5GHz band = a/n/ac, bandwidth = 20 MHz
Logging into the cable modem, the 5GHz band is running on channel 149 & the modem reports that the interference level is "acceptable". The 2.4GHz band has 11 channels - 1 through 11 with the current channel set to "auto". The interference level for Channel 1 switches between "acceptable" and "severe". If I switch to channel 2 through 11, the interference level is "severe".
I don't understand why the 2.4GHz band does not provide reliable operation. Can someone explain? How do I fix this?