New 4K X1 Box failing to sync Cloud DVR recordings - Works on Stream App only

I am looking for assistance with a persistent DVR syncing issue on my main 4K X1 box. This is now the second box (including my previous non-4K model) to exhibit these exact symptoms, and I am hoping to find a solution.

The Problem:
My Cloud DVR recordings are perfectly visible and playable on the Xfinity Stream app (Smart TV, Mobile, web site, etc.). However, my 4K X1 box only displays about half of my library. Frequently, the Recently watched appears empty or is missing the most recent recordings I am currently in the middle of watching. I basically now have to just use my smart TV Xfinity Stream app because most of the time the box is in this glitch state. I pay too much money per month to keep dealing with this issue and have to always reboot the box multiple times a day just to get it synced back up for it to glitch out again.

Troubleshooting performed:

* Initial Setup: The new 4K box worked perfectly for the first 6 days. On day 7, the syncing issues returned. The percentage is always accurate but the recordings are missing. For example, I could have 37% space with 37 recordings and then the box will glitch out and still show 37% space but only 18 total recordings are there.
* Rebooting: I have had to unplug/reboot the box up to 10 times a day. Sometimes this restores the library for an hour, but they inevitably disappear again.
* System Refresh: I have run multiple System Refreshes (1 per day basically) via the 4k box with no permanent fix.
* Connectivity: The box is otherwise functioning Live TV, On Demand, 4K viewing, etc. work fine.

It is frustrating to pay for premium DVR service and 4K hardware only to be forced to use the Smart TV app because the dedicated cable box cannot maintain a connection to my recordings. It seems like there could be a handshake issue between my account's cloud library and this specific hardware because it is literally only the 4k box that is having ANY issues with the DVR recordings. The 4K box is the only box I have, and I do not have any others.