Mag 254 was working fine, now consistent buffering

[ashooman]

Am new to the forum, but I subscribe to a monthly service using a mag254. Everything has worked well for weeks, then I upped my cable internet speed to 300mb, replaced modem with a netgear c6300 to maintain speed, and have been having issues with most channels. I have tried changing buffering seconds. Am just about to try manual ip and using google DNS. Using hard wired connection, wireless is a little better......any other ideas?