Modem compatibility

Is it just the wi-fi?  Ie: a wired speed test works fine?  That, and the link that CCAndrew provided, tells you whether your modem is compatible and is working well.  The wi-fi is something you create in your own router (in your case your router is built-in to the modem.)

 If just wi-fi, all the usual rules of wi-fi apply including changing locations of both the router and the client devices, possibly using other bands and/or changing the channels within the bands.  Some things are just hard – like punching a signal through your central HVAC system or apartment complexes.  (Wi-fi is on unlicensed bands that everyone shares so if you have close neighbors, you just have to hope they're playing nice.)

There are also: separate routers (Separate routers typically outperform the ones built into modems), extenders, access points, mesh systems etc.  Xfinity has their pods but they work specifically with their gateways and you have to follow certain rules.  And depending on your home layout, more (any?) ethernet wiring might be an option.  (Lately with all the virtual meetings, I have really learned to appreciate wired internet even on laptops. It's just so much more robust.)

Thank you Andrew. I have already purchased the modem so at this time is there anything I can do to improve the wifi signal. Do you recommend an extender and which one?

FWIW, this one has a 10/100/1000 capability;

https://www.amazon.com/UGREEN-Ethernet-Adapter-Converter-Chromebook-dp-B07TWGHM99/dp/B07TWGHM99/ref=dp_ob_title_def

Thank you, it is just the wi-fi. The only device that is wired is our tv as that is the closest device to our modem. My son's Chrome book is in his bedroom and that does not have the option to be wired. 

Here's an example of a USB to ethernet adapter that says it supports Chrome OS:

https://www.amazon.com/UGREEN-Ethernet-Adapter-Nintendo-Chromebook/dp/B00MYT481C

I use a similar adapter on my Windows laptops that lack ethernet ports and they work very well!

Thank you all for your help.

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@strega7 wrote:

Oops, I didn't notice that the one I linked to is a little dated.  Thanks, EG!

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Quite welcome. I mentioned it because the OP stated that they have the 600 Mbps speed-tier.

You. The Original Poster.

Unfortunately that is where the cable wire is coming into the house. I know wired is the way to go but would it make sense to have no devices wired and just run them all on the wi-fi network?

No, I'm not saying you specifically want to unwire anything.  Just that you might want to think about ways to get the most important parts wired.  If your son is doing classes on-line, you might set up a workstation where the gateway is.  Or if there's an adjoining room, it's easy to run ethernet through a wall.  There are also flat ethernet wires designed to be run under existing carpeting.  Just throwing out some ideas without knowing anything about your home or priorities. 

what does OP stand for?

I have the same problem. Even though the Xfinity compatibility site says that this modem is compatible, after I upgrade the service from Xifinity Blast (up to 400 mbps download speed) to Extreme Pro (800 mbps download), that actual speed dropped to 110 mbps on a wireless connection and 57 mbps on a wired connection. Yes, wired connection is even slower! Xfinity claims that it is Arris's problem, but Arris says that Xfinity is supposed to "re-provision" the modem to work for 800+ mbps speed. Xfinity tech I spoke to had no clue on how to do it. It has nothing to do with your wireless signal, so an extender will not help.