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Unit selection policy expression evaluation timeout.

What would cause unit selection policy times out after 5 seconds? We are a new DeltaV installation (Dec 2016 Ver 12.3) and have run with no time outs till (Sep 2017) over the last few weeks we have 7 time out events. Guardian has recommended to increase the original 5 second time to 30 seconds, but what has changed in the last few weeks that this amount of change is required? Is this a result of high network traffic or any other load/hardware issues?