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Replaced the cable with a CAT7 external cable. That is more like it. Thank you for your valuable help! I believe we can close the issue :)

Thank you Selberg, I will try to change the cable in the next few days as that will be a tricky job :( This was helpful thanks!

Well, now I feel dumb… But I can't understand why is that, I am connected to the router directly with my laptop which is equipped with a gigabit eth adapter: https://www.intel.com/content/www/us/en/products/sku/82186/intel-ethernet-connection-i219v/specifications.html Using the original POE adapter included into the NR7101…

Thanks Selberg. Here's the result. Pretty much unvaried… 1. 2.