When the issue with a feed is with the radio side of a feed setup (antenna, scanner/SDR, coax cable, etc.), this won't cause a feed to go down. You would still be able to connect to the feed but there simply would be very little audio or no audio at all. When a feed is down, as is the case with these ZOB sectors and KPCW as well, this means that the feed setup is not connected to the network or it's connected but not "talking" to LiveATC. This could be caused by a number of things: bad Raspberry Pi, corrupted SD card in the Pi, bad network cable, etc.
LiveATC is aware of the issue and is looking into it. Keep in mind that no feed is guaranteed to be up 24/7/365 and that any feed can go away at any time for reasons beyond the control of LiveATC. Hope this clears things up.
Ron