Could you please let us know how you are checking i.e. SMT or piconfig or PIOLEDB and stalebetween period and timestamp of the tag(Stale)
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Usually when this happens it means that the tag hasn't received an updated value in a while.
When you say it gets regular updates, How far apart are the actual updates?
Does that tag ever change from "stale"?
If so, is there a regular time that it changes?
If so, the tag configuration for "stale" might need to be changed to a longer period than it is currently set to. (this is done SMT - points -stale and bad points)