Ping spikes to MS510TXUP

Hi,

I'm doing some diagnostics and running a couple of pings in the process.

We have a Netgear MS510TXUP switch with 4 WAX630 AP's connected.

Now i noticed that pings to the switch show ping spikes (usually around 16ms but up to 180ms) at quite a regular interval. Maybe every 30 seconds or so. It's just one ping that spikes and then normal values again (<1ms). 

I run the pings from a device on the wired LAN to the switch and also from the diagnostics in the AP (connected directely to the switch!) to the switch and they both show these spikes.

Pings from the LAN to the APs and from the APs to the internet show no unusual spikes at all.

Not sure if this is an issue but i am looking for an explanation.

Jeroen