You can best see that when walking down the street, streaming your favorite music with Spotify and suddenly it disconnects. Xfinity cannot control all the places people put hotspots. If you are on the move on the street, bus, etc. So, there are many chances you stumble upon a non-working WiFi hotspot. Connecting to a bad Wi-Fi hotspot is often the same as having no Internet at all. Speedify uses a technology known as Channel Bonding. This allows you to use multiple Internet connections simultaneously for their combined speed and reliability. Everything including uploads, downloads, web browsing, gaming and streaming video can be improved by Speedify. Streaming traffic is more important nowadays, with all live streaming, remote work and learning happening.

Troubleshooting: Problems Connecting a Single Device to Home WiFi
General Troubleshooting Steps for All Xfinity Services
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Xfinity TV
EDIT: changed Subject to show that the wired connection instability is no longer occasional. My WiFi connections frequently show that my devices phones, tables, laptops are "connected, but no internet". Gateway restart temporarily fixes the issue. Online diagnostic tool tells me that something is wrong that may be impacting my internet experience and offers to restart the gateway. This just keeps happening over and over and over again. Preventing me from working from home, which is less than ideal during a quarantine Wireless devices are 2 Android phones, 1 Android tablet, 2 iPhones, 2 Windows 10 laptops, 1 Windows 8 laptop, 1 MacBook pro not all online at the same time. I have reset the XT to factory defaults and had Comcast activate it.
Because, of course, you need to finish your work, get back to your video game, or scroll on social media. So here are a few ways to get your internet up and going again. There are two easy ways to do this. Sometimes the problem can be the device itself.