CM400 slow with Netflix on Comcast

DarrenM limiting bandwith does not effect by the speeds or issues that would cause buffering. They limited the amount the data you could use. Every ISP besides Timewarner limits the amount of bandwith you can use. and when you do go over your amount, you just get charged more on your bill, also the limit on bandwith depended on what region you were in. Now as for buffering check how far you are from the router, check for interfernece on the router. a wall even can cause lots of issues depending on what is in the wall, try changing channels on your router to 1,6,11 non overlapping channels for the 2.4 Keep in mind wifi is very sensitive lots of things can be effecting the wifi even if you think it wont, being 10 feet from the router can cause issues if something around there is interfering with the wifi, also move your router up into a high location that is visable, not hidden  or being blocked.