You are right, but then it would mean that they have, all of the sudden, so much to do, that they can't respond to pings.
@AxL1971, think you need to double check your wiring, configs and maybe open a support case if it doesn't make sense, what firmware are you on?
BTW - I'm having trouble with ping responses on MS425 since upgrading to MS15.x.
At full hours (like 8:00, 13:00, 19:00) the response times to pings would rise up to 1000ms for no reason, last maybe a minute and then return back to normal.
Support is on it, since over a month and they don't see anything weird in the network and are unable to replicate in their lab, despite us seeing this in multiple locations.
Never had this weird thing in previous versions.