YouTube Always Buffering After Modem+Router Switch

[ToxiicNhoj]

Hi, so recently my ISP (Cox) sent over a new Modem/Router Combo (ARRIS TG2472G Rev 3.0) to replace my current one. Internet speeds are working fine, and everything else is working solidly (120 Down/10Up). The only problem that I seem to have been encountering is YouTube buffering on all of my devices, whether if it's through wifi or ethernet. Is this a problem with my ISP, or perhaps router settings? All replies are appreciated!

 

[jsmithepa]

I would delete my youtube cookie see what happens.

 

[ToxiicNhoj]

I would delete my youtube cookie see what happens.

Tested this out, and sadly not the problem. Thanks for the suggestion though!