Have you found anything online about this waittype? I have a new server that's showing this as the highest waittype
PatternSample EndedSeconds Samplewait_typeWait Time (Seconds)Signal Wait Time (Seconds)Percent Signal WaitsNumber of WaitsAvg ms Per Wait
WAIT STATS2015-07-28 19:50:01.54730QDS_SHUTDOWN_QUEUE60.00.00.0160000.0
Not a whole lot I can find online...
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