EpeR1:

Dear OpenWRT Team,

Some of my ar71xx devices enters in a reboot-loop, when Ap's signal is lost, in Client (sta) mode. I do not know what I am doing wrong, but I tested with:

8devices Carambola2 (AR9331-AL1F cpu, 16MB flash, 64MB RAM)
8devices Centipede (AR9331-AL1A cpu, 16MB flash, 64MB RAM)
TP-Link TL-WR740N/v4 (AR9331-AL3A cpu, 4MB flash, 32MB RAM)

And I tested on LEDE v17.01.4, v17.01.6, OpenWRT v18.06.1, v18.06.4 versions, but no difference. (Downloaded from openwrt's "Stable Builds" page)

What I did:
Switched these devices to 'sta' mode, adjusted wpa2 password, BSSID, network device, etc..
Everything is working correctly, I was able to ping google, etc.
Then I switched off my Ap (pulled out of the socket)
About 3 minutes after, the Carambola2, and Centipede rebooted.
Circa 10 minutes later the TP-Link is also rebooted.

If I did not switched on my Ap, the Carambola2 and Centipede rebooted in every 3 minutes, and the TP-Link in every 15 minutes.
A few seconds before every reboot, the system on these boards was fully freezed, I could not press enter, or type anything. (I was using a USB-serial adapter)

After circa 6-8 reboot, the Carambola2 was fully freezed, and never reboots anymore.

If switched on my Ap, while devices was rebooting, then everything worked correctly, and well.

I observed that, If the wireless network was opened (passwordless), the frequency of rebooting, was slower, Carambola2 was rebooted in every 5-8 minutes, instead of 3 minutes.

My Ap is a TL-WR1043ND with OpenWRT/LEDE v17.01.3 ooperating system.

I am not sure it Is a power supply problem on Carambola2/Centipede, because if I switched to Ap mode these devices, the system was stable, I could connect with my mobile phone, I could done some speed-test, and the device never rebooted. On TP-Link, I used an original AC adapter.

I tryed Carambola2 with OpenWRT ATH79xx Snapshot version, but if I switched to sta mode (on Luci page), the whole system was fully freezed, and never rebooted, and I could not continue adjusting password, networtk, etc.
Later I checked (with: "ubus call system watchdog" command) the watchdog was offline (by default), so it does not rebooted.

+1 Information:
The Leds on Carambola2, in ATH79xx snapshot image, is switched, so eth0's led is blinking on eth1's socket, and reverse.

Here is some (re)boot-log, with my comments:
https://pastebin.com/1EQtBuV8

https://pastebin.com/jivjVhqh