Don't run out to replace your modem just yet, based on a few unorganized observations. You haven't offered any technical information to justify your diagnosis. Not surprising, since they don't teach troubleshooting of cable TV coaxial distribution systems or hardware in network specialist school. Here's a list of things we need to know and see before anyone can accurately diagnose the installation:
In most cases the cause of low data speeds is a combination of too little signal and too much interfering noise getting to the data modem, causing data decode errors. That's not the modem's fault, it's GIGO. Occasionally folks also use the wrong tool to measure their data throughput. Post your information so the forum volunteers can dig in and get you the right answers.
No modem will work with level issues. Don't waste your money.
you are probably having some sort of intermittent problem or the present modem is an obsolete 4x4 one and can't handle the bandspread of 16 to 32 channels. Or there's interference
Need to see the level and error log pages without resetting it to see actual history.
I did not ask that as a question. I ask what modem brand. Also I said I was a network support specialist so I know the protocol, what my line signal to nose ratio is spose to be. So pls just answer my question on a reliable cable modem brand.
There are several brands with reliable models and different feature sets. You will need to purchase a DOCSIS3.0 modem that has been evaluated and approved by TWC for provisioning to your specific internet service plan. Those details are in a note pinned at the head of the topics list HERE:
You'll find similar information posted here:
Not all approved modem models can be provisioned for download speeds above 50 Mbps, not all models support IPv6, and not all approved modems perform properly in portions of TWC's network constructed with non-adjacent DS channel assignments or operating more than 16 DS channels total. There is no single universal correct answer!
Karl and myself have had decades of hands on experience which is something they can't teach in school. Yet we learn something new every other day...
TWC ads say "speeds up to" And that means you might get what you pay for, they refuse to respond to anything in the 80-100% range and that's using their doctored speed test located where their Intranet- anycast DNS servers are, at one of 4 RDC's scattered accross the US.
The real world Internet is a lot more cruel as they refuse to pay the transport/ backbone ixp's for peak bandwidth and cut back with Level 3 in Nov 2016.