I'm running Debian GNU/Linux on my APU and happily using it as a router. However, intermittent crashes ruin the generally good impression I got from the device. It's running at normal temperatures (around 56°C CPU temperature), with a BIOS released on 09/08/2014 on a Linux kernel from Debian backports (4.3.3-7~bpo8+1). I'm monitoring the device via serial console and receive kernel messages there, but no kernel oops, which puzzles me a bit. Crashes happen intermittently, about every 10 days. I didn't find a good way to reproduce them, yet. After the crash, the box doesn't respond to pings nor on the serial console. However, the ethernet LEDs are still flashing. I usually (tell my mildly annoyed wife to) pull the plug and restart it to get back connectivity.
Initially, I suspected a bad driver for an additional USB-Ethernet adapter I'm using. However, a) these kind of problems usually get me a kernel dump and b) the problem definitely persists without that device plugged.
Does anybody else experience a similar problem? What would you do to diagnose the problem? Anything helpful I can try the next time the box is in that frozen state?