This is how I fixed my "no show" reminders. I had had 3 xfinity updates and 1 system update but nothing worked. I started to set a reminder and noticed that the "display" said "All TVS". I changed it to "This tv" and then hit confirm again. After doing this the reminders worked. The only problem was that you have to change the display on every reminder. It is set up to say "all TVs" and I can't find a way to change it, but it's better than nothing. Hope this helps.
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