(Very) unstable network between playit tunnel and my friend trying to connect to my Minecraft server

Both me and my friend lives in the same country. When I try to connect to my server via the playit tunnel it works just fine, however my friend keeps getting constantly disconnected when joining:

The server is being hosted on Windows Subsystem for Linux 2 under a Arch Linux distro on my laptop. Both playit and the Minecraft server runs there. The server is a Forge 1.16.5 server with ~40 mods. My network uses carrier grade NAT.

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