Subscribed to HDHOMERUN Premium service.
Wife noticed Hallmark was missing in guide and not happy. So looked into it and I noticed that it's actually not in the Tuner anymore either. I made sure that it wasn't just hidden for some odd reason as that would have been an easy fix.
However, channels recently updated to the 11/20/2018 build and wanted to ensure it wasn't related to that. Don't think it is but who knows?
Anyone else notice Hallmark's absence?
Of course it happens over a holiday. 
I found this other topic...
https://forum.silicondust.com/forum/viewtopic.php?t=70269
I'm left wondering if this is a legitimate screw-up by Hallmark or an intentional removal during the most watched period to drive more direct subscribers to their own service.