The issue ended up being the location services on our Macbook pros being turned on. It turns out some of the options can cause this latency about once a minute when on wifi (the latency didn't show up when connected to ethernet). I turned off location-based suggestions and location based apple ads which seemed to do the trick.   I found out about this issue here: https://apple.stackexchange.com/questions/263638/macbook-pro-experiencing-ping-spikes-to-local-router ... View more