Purple-screening 13.4 during SMB copy

This also occurred in 13.3. 13.3 was the installed version at system reset (I think).

I am using two ETH adapters and this happens with both.

One of them is a 10Gbe SFP+, QNAP T310G1S.

When I start a copy after a fresh reboot, the speed will start at around 400Mb/s, but will slowly degrade over time during the copy. If it gets as low as 80Mb/s or so, a purple screen is imminent. At this point I can stop copying, but the OS will make popping sounds from time to time and if left alone (e.g. playing Youtube, or opening video exporting app) the system will eventually freeze, and then purple-screen.

If I stop the copy before it gets too low, e.g. 200mb/s, I don't have issues unless I start using apps that put a high load on the system. But if I start the copy again later, it still starts at 200mb/s and continues to decrease.

FYI I can also get the system to purple-screen even if I do no SMB at all, but just open up 3 high-memory-intensive apps, like Black Magic apps and my camera's export software. It's less common to purple-screen, but has happened on at least two occasions. And usually I'm not using more than one of the apps simultaneously; this is just with the apps open and idle, while using the 3rd.

So maybe I have a memory fault.

FYI the same doesn't seem to occur if I copy a lot of data to an external SSD, attached via USB (as doesn't support TB4).

The other Ethernet device, which runs at 1Gbe, is on a USB hub so not TB protocol.