@Marvin_S 

Hi Thanks for the reply

The upgrade was set to automated update. it was not done via PC or Phone but automated by the router.

It did not loose power during the upgrade, logs dont indicate any outage and its on the same power source as my NAS/Servers  they did not lose power.

The network worked without issue before the upgrade.

i had already tried a factory reset, its worth mentioning i have 2 of these routers and both recived the update, and both are behaving in the exact same way.

wifi clients fail to get an IP multiple times, if they eventually get an IP then they cannot access the internet via this device. devices on LAN operate as expected.

thanks

  @Marvin_S 

HI sorry for the delayed response.

I got some time to sit with the devices and first performed a hard reset (power on and then hold reset until light blinks and it resets router)

I tested again, same symptoms

I then tried installing 1.2.4 firmware, failed as it is an older version.

I then tried installing 1.3.1 firmware manually. this worked. tested and same symptoms.

I then put the router into safe mode (power off hold reset, power on while holding reset until middle button is orange) 
I installed 1.2.4 from here. then tested, same symptoms.

i then upgraded using the routers "upgrade" button to 1.3.1 again, and tested, same symptoms. 

I am able to get online, and if i use static IP i can get online but connection to the router drops sporadically. 
WIFI devices cannot get an IP, nor can wired devices. 
I have turned off DHCP server and turned it back on again, no difference same symptoms.

This happened to 2 routers with the same 1.2.4 firmware having update 1.3.1 pushed to them. 

I have attached the logs for when i did the safe mode install of 1.2.4 and then again after 1.3.1 upgrade. 

im at the next point where putting wire shark between the router and PC to see whats happening is my only option as the device logging is limited. And i feel like i have exhausted all avenues to "fix" them using standard methods.