Latency is absoultely off the charts

Hey, @foxreinhold. Thanks for posting on our Community Forums to let us know about your situation. I'm sorry to hear about the latency issues you have been experiencing. What type of connection are you using when this happens (Wi-Fi or Ethernet)? Is this happening on multiple devices? Have you tried any troubleshooting steps so far, such as rebooting the modem manually or through our awesome Xfinity app? 

Thanks for getting back to us, @foxreinhold. Is the test result you just shared over Wi-Fi or ethernet? Are you currently playing online? What specific issues are you experiencing currently? 

If you're using WiFi please go get an ethernet cable and plug your gaming rig into your XB8.  Apartment complexes are often "not suitable" for WiFi gaming.  Way too many people competing for way too little spectrum.  Evening rolls around and tons of people are done with work/school/etc. and get online and starts streaming, gaming, etc.  A cable might not solve your problem but if you're not using one it is by far your best chance of fixing it.

If you're still having a problem with your gaming rig hardwired to the router...

Modems & routers don't have performance issues based on what the clock says.  They're either more or less random or caused by some outside source.  It's probably a network congestion problem.  Too many people on the same cable segment using too much bandwidth at the same time.  Evening is the classic time to have this problem.

I would not expect buying a modem/router to help since this sounds like a congestion problem.  Unfortunately apartment buildings and complexes are often a worst case for this.  Cable connections are shared between multiple homes.  If you're talking about a neighborhood of single family homes and/or small apartment & condo buildings Comcast can just split a segment if it gets too congested.  Larger apartment buildings and complexes may not allow segment splitting without assistance from the owners.  Many of them were wired years ago when cable was just for TV.

One thing that may be a glimmer of hope is that Comcast is rolling out increased upload speeds.  Or it might be a harbinger of additional doom.  Comcast equipment got the increased speeds first and just recently they started slowly rolling out increased upload speed to customer owned equipment.  But this varies by location.  Some places are already getting the increased speeds to customer owned equipment, others haven't even gotten them for rented XB8s yet.  So how fast is your upload at a quiet time of day?  1200 is usually 1200/35 officially, up to 1440/40 on a good day with no congestion.  New speeds are 100+ upload.  Can you ever get more than 40?  If not things might get better when Comcast gets around to rolling out increased upload speeds to your area.  If you can they may well get worse as Comcast rolls out increased upload speeds to customer owned equipment.  Comcast equipment got the faster speeds first.

Hitron CODA56 is one of the three modems Comcast currently approves for increased (OFDMA/DOCSIS 3.1) upload speeds, and is what I would buy if I wanted to buy a modem without voice support.  The only other modem with a 2.5Gb ethernet port and supported on the 1.2Gb plan that is currently supported for OFDMA upload is the Netgear CM2050V, and using one of those requires that you have Comcast VOIP service.  Do note that the Hitron CODA56, Hitron CODA, and Netgear CM2050V are all modems not routers and you will need a separate router to make them work aside from plugging one directly into a computer with an ethernet cable.  I don't think new gear is going to fix your problem but if I were to buy something right now I'd get a Hitron CODA56 (no phone) or Netgear CM2050V (phone service required).

... Netgear CM2050V (phone service required).

Not quite. A device that supports phone service is required if you subscribe to Home Phone, but Home Phone is not required to use a modem that has support for the service. Customers without Home Phone just doesn't use that feature of the device. Typically we don't buy devices with extra-cost features we do not intend to use, but there are circumstances where we might have reasons for doing so.

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

I am in the exact same boat 

@user_zr5ktu 

Please create a new topic of your own here on this board detailing your issue. Thanks. The original poster has not returned. 6-month-old dead thread is now being closed.

For future reference, it is better to submit your own post as it creates a ticket to get help, and posting on someone else's older thread can delay getting help.