Regardless of the source of the interference, you can try to fix the problem by moving your wireless router within your house, or not using too many wireless devices near each other.
Or, if you have a router that uses only the 2.4 gigahertz radio frequency, you can buy a dual-band router that uses both the 2.4 gigahertz and 5 gigahertz frequencies. The 5 gigahertz frequency travels shorter distances, and is less likely to pick up interference from a neighbor’s Wi-Fi.
Q: I rent a combination cable modem and Wi-Fi router from the Comcast Xfinity internet service for $14 a month. I’d rather buy a replacement modem than continue to rent one. How can I find a compatible replacement?
— James Martin, Maple Grove, Minn.
A: You have two choices. Buy a Comcast-compatible cable modem that has a built-in wireless router ($90 to $350), or buy two devices, a compatible