Figuring out the cause of Internet connectivity problems in the invisible world of wireless networking is difficult and a challenging guessing game. We recently had problems which included poor performance and interruptions of a few seconds to a minute, affecting Netflix, smartphones, tablets and, fortunately, my Mac's wireless mouse. The mouse problem pointed to some type of RF (Radio Frequency) interference and with the help of NetSpot's free (I love free) app, I noticed that we had three very strong Wi-Fi signals, one obviously our TP-Link router, but the other two were not familiar, but had to be very close by. I then noticed our Spectrum-provided cable modem had a "WPS" (Wi-Fi Protected Setup) button on its top, even though we didn't sign up for their in-home wireless network service. The wireless network names (SSIDs) on the cable modem matched the two unfamiliar names. The label also listed the userid and password to logon to the cable modem, which allowed me to disable those wireless networks, as shown below. With those changes made, our Wi-Fi/Internet issues have disappeared.