Having exact same problem at my place, also for about a week now. Someone messed something up royally with an update or backend change in the systems. No reminders go off, I keep missing shows I wanted to see which is kind of the whole point. Most of them are not available "on demand" such as sporting events, movies on many channels, older television series. 90% of single "one time" reminder do not pop up for any channel, any show during the daytime. An odd 10% does, but they seem to be sporadic and no clear pattern. Long term reminders will pop up, but not always.
Before you ask, no these are not your internet based channels.
On a side note, why don't reminders appear on the Stream app as well through the cloud? Often Stream will be functioning correctly when the X1 box has problems.
I have noticed a trend to front loading data on our boxes by developers which disrupts services if storage space is not available here. This is a bad idea if the box is not set up and divided proportionally for this task, and customers are competing for the same space with their own data such as a DVR recording for example. It's time for the next box with more advanced design, and a re-designed cloud and backend system that was designed upfront as a system of systems, not connected pieceparts developed by completely separate teams with separate objectives. (I also suspect sustaining and new development are separated by a wide gulf, which is not a best practice under CMMI and other high reliability guidelines)
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