Lynn's wifi drops out from time to time. Leo says that's usually an indication that your router is worn out, but if it's new, then it could be congestion from other WiFi signals in your neighborhood. Using a dual band router with a 5Ghz frequency, that can help, because not only are other routers using 2.4Ghz, but there's also all the smart devices that use them as well. So it's really congested out there.
Corey bought an ORBI MESH router and enjoyed 350MBps downloads, until recently. It's now down to about 10MBps. He tried another Linksys mesh router and the same issue happened. Leo says that it sounds like the problem isn't at the router level. Leo suspects that Corey may get full speed from a wired router. If so, then there's a congestion or interference issue. It could be a "WiFi hostile" environment that is causing interference. Maybe a lot of devices are clogging up the wireless spectrum where he is.
Jeff wants to know why his internet slows down at night. Leo says that he ends up sharing bandwidth with his neighborhood and if it's slowing down in the evening, it's because everyone is on Netflix. He also has to factor in Wi-Fi congestion. Jeff could bypass the Wi-Fi router and plug directly into the modem and see if it speeds up. If it does, then he'll know it's Wi-Fi congestion. If not, then he'll know it's his because of heavy use in the neighborhood.
Steve's Dell Inspiron laptop drops Wi-Fi all the time. Dell claims to have fixed it via remote access, but it didn't work. Leo says that it's likely the person at Dell tech support had very little training and was following the directions in the notebook. All too often it doesn't fix the problem. What he'll need to do is call them back and ask to have his case escalated to tier 2 or even tier 3 level support.