Installed a new modem/router, weird internet issues

[Mr.357]

Two days ago my ISP came and changed my old modem (motorola surfboard) to a thomson modem (it also works as a router and a voip device). Since it's brand new I removed my old router from my network setup and now the new modem does everything. The problem is that sometimes websites just don't work and won't load and this mostly happens over wifi while my PC connected via an ethernet port seems to be running fine. The speed over wifi is pretty much the same as via cable and there doesn't seem to be any packet loss or jitter, but sometimes websites just refuse to load or load half-broken (thumbnails and comments on youtube won't load). Is it just a shitty router and should I put my old one back in or is there something I should configure in the new one?

[FalconKrunch]

You might be able to put your current router in bridge mode and just have it act as a liaison between the ISP and your own router, most ISP Modem/Routers are absolute trash.
If it isn't supported by your router in the control panel, you can usually call them up and ask them to do it remotely.

[Mr.357]

Digging around a bit on the good old internet says to disable power saving features and IP flood detection. Just did that and Youtube loads fine but I'll have to do a lot more testing before I can say it's fixed, it still feels sluggish

[Mr.357]

After a week of using it, this thing just keeps slowing down and breaking connection. Called my ISP and they said to check the usual (restart, check cable, DNS, etc.) and after doing those things they told me they'll "look into it". Can i just buy a new modem myself and throw this thing in the trash?

[Saxon]

All in one routers/modems given by the isp are often ass, return it and go buy a standalone modem and use your own router if they support it.

Alternatively find a way to use bridge mode which will just make it run just as a modem and use your own router again. If you have trouble setting this up you usually can ask the ISP to toggle it from there end.

[Nookyava]

If you have the money and are able to I heavily suggest getting your own modem and router. I did this after living in Florida for awhile since the connection is just absolute garbage. Not to mention Comcast would give just absolute shit hardware.

Plus you're able to use it regardless of your ISP, and can do a lot more tweaking. Plus reliability.