hosts not responding in VC25

I have 15 esx hosts now on 35. randomly throughout the day/night i'll have a host show up as not responding for a minute or two then connect again in VC.

However throughout these outages the Host is fully up, i can connect to it directly with no issues. the cpu and mem loads are low. I even had one host in Maintenance mode and at one point in the night it was read as not responding (received host down emails)

can't see anything in the VC logs to show why they come up as not responding.

I have HA disabled just in case these would trigger an HA failure.

in my setup i have the console and vmotion on the same vswitch with dual nics setup. (i've also tried moving vmotion onto another vswitch and still same issue)

any thoughts?

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