MS60 Satellites generates a lot of traffic to netgear.com

I've got a MR60/MS60 System with an MR60 running in AP-Mode and three MS60 Satellites. Two Satellits are connected with Ethernet backhaul, one with Wifi.
Heres a picture from the Admin-Gui with the IP's

I'am running a Pi-Hole Docker Instance (https://pi-hole.net) to block some Ads in my network. 
In the traffic-log Files of Pi-Hole I can see, that the three satellites are doing requests to www.netgear.com every second 24h/7d a week. 

I'm not yet figured out, what they are really communicating. I've just see the mass of DNS requests.

• Anyone an idea why the MS60 Satellites are doing such a strange things?
• Anyone know a setting to stop this?