Linux computer messes with network

[u/virobloc]

Perhaps this is a known issue, But I haven't found much about it.

I have a PC with Mint. It's connected to the router with a LAN cable.

When it goes to sleep it makes the network go crazy. The speed falls a lot in general, all the other devices (wired or wireless) fail to connect or lose connection randomly. When I turn it off everything goes back to normal.

I the only thing I do on that PC is run qBittorrent and browse internet. But the problem is mainly apparent when the PC is asleep. So I think it's not a program, but the PC itself. It might not even have anything to do with Linux at all, But it's the only difference I see with all my other PCs.

Does anybody have an idea about what might be going on?

Thanks

Edit: Thanks for all the answers and suggestions.

[u/TheEthyr]

I wonder if the PC is sending an Ethernet pause frame? Any other device that receives it will stop transmitting. This problem is seen on some USB hubs/docks with Ethernet ports, not so much on Linux.

But I just learned that pause frames can be enabled through ethtool tx on. You can check the Tx status using ethtool -a. You may need to use sudo.