This thread is supposed to be specifically about the Xfinity provided broadcom chip modem/router XB6-T they are providing. If your tplink is dropping wifi check their support and forums. If the wifi is up but the internet is down you would check with Arris. If your equipment is over two years old the easiest solution is to buy new equipment. Ideally you would isolate down the failure to the modem or router and replace that part only. Before replacement it's a great idea to check for new firmware from the manufacturer at least and uses wifi analyzer to make sure a neighbor did not out in a super powerful router using the same channel you are (if they are you would move to a less congested channel). If you narrow it down to the modem, replace the modem, and issues persist directly connected to the modem it's much easier for the Comcast/Xfinity tech to troubleshoot by checking the line and not blaming your equipment. Networking equipment is run 24/7 in all types of humidity and heat with no breaks. Everything man made fails. *Edit to add Wifi still running perfect without a single hiccup since my last post thankfully. The XB6-T seems good as just a modem thankfully. I do see random unnamed wifis showing up with different Macs then the XB6-T 2.4ghz and 5ghz channels I had it set to, but thankfully they have not caused a wifi issue for my Asus and devices. I am pretty positive these wifi signals are coming from the XB6-T because the Macs are very close to what the unit advertises. I will not be surprised to find out these are specifically for their xfi cellular service they are pushing with notes of hotspots everywhere. That's most likely the literal reason they are offering a $35 discount for unlimited by renting this modem for $15. I can't wait until they have to offer unlimited in my area so I can return this modem to them.
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