Router Network crashes when Plex server running

Hi, I’m just starting to use Plex for viewing movies on my Samsung Smart Tv. I’m using a MacBook Pro 2017 as a server and everything is working great, it’s a nice tool. However, after a couple of time (60 - 90 minutes) the whole internet connection of the router crashes and every devices lose connection to the internet. The only thing that helps is rebooting the router. But if I start Plex server again it crashes the router again after some time.
I’ve already tried port forwarding to fix doubled NAT (I have a modem/router and a Wi-Fi/router), disabled the DLNA server and disabled all extras such as trailer, but nothing helped. It still crashing my router.

I hope someone can give me some helpful advices to fix this issue.

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