I've been away from the board for some time, and am only now responding. Here's what I believe to be going on. When Comcast switched the DVR functionality to store the recordings in the cloud, they created this problem. Suppose I'm in the middle of a show and hit record. The only way my cloud storage can get the portion I've buffered on my X1 hard drive requires bandwidth. It either needs to be uploaded back from my X1 DVR's hard drive (which is highly prohibitive) or re-transferred from an earlier point in the source feed, which would involve Comcast server network bandwidth rather than cable network bandwidth. The other functionality, that of buffering a channel during DVR or Direct TV viewing also requires cable bandwidth, since the X1 box needs to be receiving that data in order to buffer it. This problem cannot be fixed without costing Comcast some bandwidth. They used to provide and include it, probably because they had no easy way to shut it off, but now they do and they have. The other problem, of buffering shows so that a recording can start mid-show, should be easy enough to solve, since the actual bandwidth cost is lower. All they'd need to do is keep a buffer of all currently running shows available within their own server network, so that a cloud recording that begins mid-show can get the entire thing. I imagine they'll eventually do this and restore that functionality.
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I have this same problem, which I first noticed about the same time that the OP indicated. I also noticed that my X1 used to buffer the tuned channel while I watched a DVR recording or On Demand program, and this feature was also removed. It seems to me that Comcast made this change intentionally to conserve bandwidth, and for the rate they're charging, I'm livid about the reduction in service. To be honest, there's little about the X1 platform that I found to be an improvement over the older box we had, and I'm still annoyed that Comcast forced us to change it. Perhaps this will be the straw that breaks the camel's back, insofar as Comcast TV and I are concerned. Cloud schmoud!
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