FYI, I did replace Xfinity modem with my own speedy modem from Best Buy. Worked fine for a while (I mean month not years) then crawled slower and slower. Called Xfinity and they did all their usual useless trouble shouting while on phone and then blamed my almost brand new speedy netgear modem. For me, Getting a new modem only gave Xfinity someone else they could blame.
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