@Kevin_Z Ok, small update. The problem is basically solved. The solution is not using anything on the router other than the Wi-Fi itself. Linking an email account to the router means sending...

@Kevin_Z I sent as requested the config of my router 5 days ago and.... silence. Any information?

@Kevin_Z I can confirm, that I only use 5GHz wifi and custom DDNS (no other options like parental control, qos and so on....) - so I know how many requests the router sends to avira.com domains. Last...

For example: 7040 requests per day from ONLY one device. (Request to ast-dual.safethings.avira.com) I have never and nowhere enabled permission for TP-LINK AX55 router to send such big amount of...