Hello @TB8246,
Thank you for reaching out to the Community and telling us about this issue. I'm sorry to hear you're running into this problem. When did this issue first start? Is it affecting only one specific reminder, or multiple? If its happening with only one, does deleting and recreating that reminder resolve the issue?
Do you keep your Quicken file on your C drive or is it on a shared network drive? Is your Quicken file synced with any cloud service, such as One Drive or Dropbox (if it is, you will usually see the service name listed in the file location)?
The simplest way to check your file location, if you have Quicken up and the file open, is to click on File, then look near the bottom of the list, just above where it says Exit. It will list the file locations for the 4 Quicken files you have most recently accessed, with the one you are currently in at the #1 spot.
Thank you.