For the past couple days i have been getting an error saying i cant connect to XBL because of "IP Adress Error"

I have looked all over the internet and cant find any solution.

My router is the Motorola NVG510 which i recently read reviews on saying its horrible and i see why they say that.

Is it at all possible to fix this error? The whole unplugging my router for 30 secounds then plugging it back in only works sometimes.

Please help this is the only place i could think of that might be able to help me