It is very weird but after installing arping, my Ikea gateway hung up every 30min or so.
Something to do with the apring’s way of auto-discovering or checking for services?
I removed the ikea gateway from the network binding and hid all things that have the gateway IP.
I had the pin interval set to 60seconds, and later to 10min - so I doubt that this was the issue.
I will try to look into this a bit further in the future.