I bought this modem years ago to knock the $10 a month rental off my bill. Pays for itself quickly.
Motorola Surfboard SB6141 DOCSIS 3.0 High-Speed Cable Modem- Black (OEM Brown Box) https://www.amazon.com/dp/B007IMPMW4/ref=cm_sw_r_cp_apa_i_AWIVDbSGFRCKX
ARRIS SURFboard SB6141 should do just fine. I have this modem and it works great for my 200 Mbps plan. Just be sure to wear a welding mask when looking at the lights; they are blindingly bright.
I have this and love it.
https://www.amazon.com/Motorola-SURFboard-SB6141-DOCSIS-High-Speed/dp/B007IMPMW4
It's pretty easy to do and I recommend it, because this is a purchase you will recoup quickly. You can check a list of compatible modems here:
Pick the model that matches your budget and the speed of the contract you have with TWC (provided that they are honest about it, and you now know they aren't). Once you have a good candidate or two, buy the one with the best Amazon reviews -- I ordered the Motorola SB6141 SB6141 Modem for example, 4 years ago.
Bring back the TWC modem you are leasing to one of their offices (say, at Colonie Center), then connect your own, and give them a call -- they will walk you through the process of activating it.
Important:
I think it's this one, maybe this one, but I'll have to check when I get home. Definitely a Motorola Surfboard series docsis modem at the very least though.
Now that you mention it, I also had Rocket League issues on Comcast with that modem back in new mexico so it could very well be a modem issue. Looking up the surfboard chipset, it seems like it is likely a puma 6 chipset so that would make sense. Could be the wifi router too, idk, haven't messed with that myself.
I would go with this Motorola if I were buying today. https://motorolanetwork.com/cable-modem/mb8600.html My motorola modem is a few years old, but it has been very reliable. In fact I may need to get one. There is nothing wrong with mine and it delivers the 260 mbps I get now really well. I have this one: https://www.amazon.com/Motorola-SURFboard-SB6141-DOCSIS-High-Speed/dp/B007IMPMW4. It is a few years old and won't be up to the task of the next speed upgrade that Comcast does.
According to description, you are good to 300/100 http://www.amazon.com/Motorola-SURFboard-SB6141-DOCSIS-High-Speed/dp/B007IMPMW4
> The SB6141 has twice the download capacity than that of the SB6121
What? They're both D3 modems... they're bound to D3 specifications:
Straight from the website:
6141 > Up to 160 Mbps downstream and up to 120 Mbps upstream data speeds for fast data transfer.
6121 > Up to 160 Mbps downstream, up to 120 Mbps upstream
I have an old 6120 and I'm pulling over 100Mb down with it, I download off Steam @ 15MB/s. Aside from stability there isn't much difference, you're not going to see much of an increase in speed really, they're all limited by whatever speed your bootfile is set at.