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I think we might need a little more information to help you troubleshoot this, and it's possible that this would better handled in a Tech Support case. Did you see anything in the message logs for those tags from when they went into error? Were the timestamps on the tags stale when they were in Error as well?
What type of interface are these tags coming from? If it's OPC DA and you're running version 126.96.36.199, is it possible you're running into this bug.
I'm sorry i took some time to reply.
I will get Tech Support assistance again to finalize the root cause and close this case.
Currently all the tags are working fine.
The Tags are coming from an OPC DA Interface version 188.8.131.52:
Do I need to update the OPC DA Interface version?
If yes, what else should I update?