R6250 Router dropping Internet access since V1.0.4.26_10.1.23 firmware update

My apologies everyone - this problem is NOT solved.

 

I noticed that a drive connected to the router via USB was not working, so I unplugged it and pligged it back in again - and the "disconnected from the internet, reboot router" symptoms returned.

 

A few minutes after rebooting the connection is lost again. Unplug the drive and reboot and it's still working 24 hours later.

 

I give up.