Omnia dies over night - no entry in the logs - how to debug / diagnose?

Hello,

my TO now locked up twice over night without any entries in the log:

Nov 3 04:37:01 turris /usr/sbin/cron[15771]: (root) CMD (/usr/bin/rainbow_button_sync.sh)
Nov 3 04:37:44 turris hostapd: wlan1: STA c4:04:15:5b:da:79 WPA: group key handshake completed (RSN)
Nov 3 04:37:44 turris hostapd: wlan1: STA 30:07:4d:e3:2a:b2 WPA: group key handshake completed (RSN)
Nov 3 04:37:44 turris hostapd: wlan0: STA e8:50:8b:be:75:a8 WPA: group key handshake completed (RSN)
Nov 3 07:02:06 turris syslog-ng[1936]: syslog-ng starting up; version='3.10.1’
Nov 3 07:02:06 turris kernel: [ 7.984279] scsi host0: ahci-mvebu
Nov 3 07:02:06 turris kernel: [ 7.987852] scsi host1: ahci-mvebu
Nov 3 07:02:06 turris kernel: [ 7.991378] ata1: SATA max UDMA/133 mmio [mem 0xf10a8000-0xf10a9fff] port 0x100 irq 44
Nov 3 07:02:06 turris kernel: [ 7.999314] ata2: SATA max UDMA/133 mmio [mem 0xf10a8000-0xf10a9fff] port 0x180 irq 44
Nov 3 07:02:06 turris kernel: [ 8.350623] ata1: SATA link down (SStatus 0 SControl 300)

This is all which was stored on my server which is used as remote log server. Lastlog on the server was empty.
One of my wifis (the 2,4 GHZ one) was down, the other one had no WAN connection.
Restart happened at 07:02 by power cycling the router.

How can I diagnose this further?

You may have to hook up a serial port.

You can find out how to use the serial port here:

You’ll need to log the data from the serial output somewhere. I use screen in Linux for that sort of thing, or you can use Putty in Windows.