u/Embarrassed_Use_7131

I'm having a problem with my PlayStation. Despite being connected via LAN, it's only running at 100 Mbps, even though my internet connection is 1000 Mbps. I also have a Fritz!Box 6670, but my router automatically switches to 100 Mbps. Is my PS5 defective, or what could be causing this? I've tried different LAN cables (Cat6, 7, and 8), and it still only shows 100 Mbps. Is it a handshake error, and if so, how can I fix it? Thanks!