iPhone XR Slow with MV-1000W after update 3.104

I updated the router to firmware 3.104 activated adguard home after that my iPhone XR get only 1-25Mbps Speed before the update I got 50Mbps
Someone with the same problem?

What I tried

I deactivated adguard home
Restarted router and iPhone
Changed WiFi channel
Changed dns

My Router setup wireguard, killswitch, Vpn policy, adguard Home

All other devices get Fullspeed over WiFi doesn’t matter with Vpn or without (Nvidia shield,laptop,tablet…) only iPhone is slow