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There are too many possibilities/ troubleshooting that potentially needs to be done in order to figure out your issue.
If you need any assistance please let me know.
As Angelo Minchio mentioned, there were multiple reasons and possibilities for the tag become stale. Following are the few possiblities,
- The data source may not be providing the date to the interface.
- There might be a connection issue.
- Buffering Issue
If you can provide more details like what is the Data source for these tags, how frequently it will get updated, Buffering configured or not, is there any change happened recently either in source side or in the tag configuration level etc..,