Could an overlapping network on my wifi cause interference issues?
I have been having issues with my WiFi getting hacked into with DOS attacks, jamming and more. We have our WiFi password protected, high security, and have changed routers many times before. I noticed an unknown possible multi guest network that overlaps my network so I changed channels and this unknown network keeps following right away, Could this network overlapping my network cause interference?
I agree with Mr. Berckenkamp's response. To add:
I'm assuming that switching to wired Ethernet connectivity is not an option. If not, you might consider trying Power-line communication solutions and ditch wireless altogether, especially if you have security concerns. It's hard to predict how well it will work, because it's entirely dependent on the electrical wiring in your location, but it's worth considering.
I recently switched one of my devices from wireless to PLC and am very satisfied with the results. Most solutions even have a means to encrypt the communications to be even more secure.
If it is on your frequency it can indeed cause interference. For that reason most modern routers have an auto switch system built in that automatically tries to switch to the least populated frequency. Other things that can cause serious interference are microwaves (when in use) and clusters of electric cable. Depending on your situation it might be worth to get a 5Ghz router. These have already been around for a few years but in some places their usage is still scarce.