Hello, thank you all for your suggestions. From: Julien ROBIN <julien.robin28@free.fr>

Take another well known product from well known trademarks Linksys, D-Link, Netgear, Sitecom, TP-Link, or something compatible with OpenWRT for example.

Okay, I'm going to try a new router. I don't use VoIP or TV-Services. Just a Tor Node and a hidden Service.