The most common causes for a decrease in EWT for a split priority level are:
The number of calls in queue decreases.
Agents log in and start answering calls.
Agents return from break or otherwise are no longer in the AUX work mode.
Agents are moved from another split.
Agents with multiple splits answer fewer calls in other splits.
The following conditions can reduce the EWT for a split priority level:
The average talk time decreases.
The number of calls at higher priority decreases.
The number of direct agent calls decreases.
The number of RONA calls decreases.
The number of abandoned calls increases.
The number of calls queued in this split but answered in another increases.