LAN interface crashing when using torrent app

[vicuvic]

Hello champs

I'm facing a strange issue, where whenever I am using qBittorrent and setting a speed limit above 5-6 MB/s, the LAN interface stops working.

I have an OPNsense box running on a Dell OptiPlex 3020 with a CPU Intel(R) Core(TM) i5-4570 CPU @ 3.20GHz (4 cores, 4 threads), 8GB RAM and 128GB SSD.
The WAN interface is assigned to the integrated NIC on the mobo while the LAN interface is a RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet Controller

Running ifconfig down/up all comes back to normal.
When crashed, I am not able to ping the LAN interface or to ping the LAN from the opnsense box.

Anyone had similar issue or any clue where to look?

Thanks in advance

Vincent

[cookiemonster]

most likely the usual Realtek problems.
Short of it if you're new to it, realtek nics fail under stress.
You could try to see if things improve a bit with the vendor driver instead of the os one, or -best if you can- replace the nic.