I have two BBG units that I use as headless servers, with only access 
through Ethernet.  Both have been running without reboot for multiple 
months without any issues.  I think that I mentioned that I did have a BBB 
do exactly what you describe, while running as a headless server last year, 
but at the time there was a thunderstorm in the area, and lightning strikes 
in the neighborhood. It recovered on reboot, and has never repeated the 
symptom.

So, my conclusion is that it is possible to happen, but rare, and in my 
case was probably caused by electrical transient coming in the Ethernet 
connection which is routed from a cable modem to the outside world.

For high reliability application, perhaps some extra transient protection 
on the Ethernet connection, and some kind of "ping monitor" that can 
auto-reboot the BBG.

--- Graham

==

On Tuesday, October 18, 2016 at 10:41:44 PM UTC-5, William Hermans wrote:
>
> I had a board a few days ago that just stopped working as far as ssh went. 
> So, I checked the LEDs on my GbE switch, and the lights were not lit. 
> Checking further, I found that the LEDs on the beaglebone were also not lit.
>
> So I disconnected the ethernet jack on both ends and reseated. Nothing. 
> The ethernet did not start working again until I rebooted the board, by 
> physically pressing the rest button on the board.
>
> I was curious if anyone else had experienced this same thing. This, for me 
> has actually happened only once. The board this happened to was a 
> Beaglebone green, running from the eMMC. Currently I'm running from sdcard 
> but . . .
> william@beaglebone:~$ sudo mount /dev/mmcblk1p1 /media/rootfs/
> william@beaglebone:~$ cd /media/rootfs/
> william@beaglebone:/media/rootfs$ cat etc/dogtag
> BeagleBoard.org Debian Image 2016-06-19
> william@beaglebone:/media/rootfs$ ls boot/ |grep init
> initrd.img-4.4.12-ti-r31
>
>
>
> grepping through the various files in /var/log shows that everything was 
> working fine as far as I can tell. No error messages that stand out for 
> 'net' or 'eth0'. I've also talked with a person I know who has experienced 
> this them self. Except for them, it has happened more than once, including 
> with a 3.8.x kernel as well.
>
> As far as when this happened to me personally, The board was just idling 
> for several days(5 - 6 days ) when I needed to get some information from 
> the board, and not response via ssh.
>

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