I've had the same setup for several years, using dhcpcd to request a /60 from Comcast, and it has been as rock solid as it can be. In the past week, however, my router has been throwing up errors saying that the PD request is too large, and I only get a /64 assigned to me. Is this a temporary thing upstream or is it a new policy?
I believe so. We've seen a number of posts here lately indicating so. A /60 can no longer be hinted.