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Looking to track down where a network bottleneck is

I have a customer using four (4) PoE card readers that communicate up to AWS. The readers recently started intermittently dropping offline due to a ping roundtrip taking over 400ms and then back down to 100ms and then back up over 400ms. The card reader manufacturer suggested using WireShark to do a packet capture using the IP addresses of the readers to see where there is a bottleneck in the network. I am looking to understand how to capture that and interpret the data in WireShark to determine the source of the problem.