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once you can observe a pattern in those "rare cases" then you might be able find a cause.
How can/should we help with so little information?
Date rates of 200Hz are a bit high for typical OPC server.
You may want to poke around with the OPC server settings to see if you can bump up the update rate but you are definitely pushing it.
100 Hz is the highest I would depend on an OPC interface.
LabVIEW Channel wires come in multiple flavors including a Tag type. The Tag flavor offers the most recent update and are lossy. It is no accident NI chose the name "Tag" since that is what OPC servers and PLCs expose.
You are correct Paolo!
I can not say what the top update rate can be.
OPC is generally used for slow changing values and checking what the value is NOW.