I'd try scp DVD.iso MyHost:/dev/null, [...]
Good idea - tried, and no crash! So it is media access...
Could someone else with a Le Potato try something similar? If my box is really a lemon, I'd need to return it... Wouldn't like to.
EDIT: I decided to look for CPU temp and opened the System information from Kodi on the TV. Started scp (this time pscp istead of WinSCP), and it crashed:
DVD.iso | 852260 kB | 4984.0 kB/s | ETA: 00:21:59 | 11%Fatal: Received unexpected end-of-file from server
Before it, you could see the upload speed constantly going down. Temperature went to moderate 53°C (The original heatsink is on the device). Now the funny thing is: The status display was still alive, Temperature started dropping and CPU load was displayed! So no complete crash. Kodi Web-Interface worked partially, but all other services, like SSH, Samba, tvheadend, were not accessible, so I could not extract any logs. While trying, the box died completely, eboot necessary.
Any idea?
And still would be curious if I'm the only one having this problem...
EDIT 2: To be really sure, I measured voltage: It stays at a very comfortable 5.38 V while copying the file...