I have the same issue. I just copy files via network(via cable) with rsync from local PC to USB HDD (USB HDD is attached to raspberry). In 30-90 minutes Raspberry hangs every time. I made this test with 2 different hardware sets (Raspberry + SD card + external USB HDD). I had the same issue with different hardware.
I've added photo to attach.
I have the same issue. I just copy files via network(via cable) with rsync from local PC to USB HDD (USB HDD is attached to raspberry). In 30-90 minutes Raspberry hangs every time. I made this test with 2 different hardware sets (Raspberry + SD card + external USB HDD). I had the same issue with different hardware.
I've added photo to attach.