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High ping response times on stacked 2920s with firmware 16.01.0004

I just implemented a stack of four 2920-48 port switches (ring topology).  They are all running firmware 16.01.0004 with ROM WB.15.05.  I use WhatsUp Gold to monitor its response time and I'm seeing it fluctuate.  In the past three hours, it has spiked up to 400ms fours times.  I checked its trunk ports and I don't see any send or receive errors.  I also checked the Cisco 3750 switch that the stack is connected to, and I don't see any errors there as well.  I have other 2920 stacks in my environment and they are not exhibiting this high response time.  They are all running firmware 15.16.XX.  This leads me to believe that it's a firmware issue.  Can anyone confirm this to be the case, or provide any other potential explanations/solutions?  Thanks for your time.

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