AC1750 R6400V2 gety error network chaged since installing this router

[spade203]

ever since installing this router i get network change detected and slow to load pages  

this was not a problem before this install

[plemans]

Modem you're using?

Firmware on your router?

A better description of the error or screen snip demonstrating it helps. 

What speeds do you pay for?

What speeds do you get over hardwired?