Changed my router and now websites don't load when qbittorrent is running.

[Steel-Blade]

Hello, I had to change my ISP router and now, with the exact settings qbittorrent had before the change, websites don't open.

Before the router change, I had about 750 torrents (still do), all active, the torrent queueing was/is disabled, I never used it, no upload/download limit and everything was working just fine.
I was uploading up to 25mb/s and my browsing speed wasn't effected one bit.

Now after the router change, if I just start my 750 torrents, regardless if I am uploading or not, my browsing speed stops, I can't get websites to load.
If I stop the torrents, browsing speed goes back to normal.

The router is the exact same model, I checked all the settings of the router, they are the same, same port forwarding.

I have no idea what happened, I didn't change any settings in qbittorrent.

I used to upload 1TB - 1.4TB per day and now I can't even activate my client.

It just stopped working as it used to.

Can someone please help me?

Regards