Netgear R8300 Resetting to Factory Defaults

[gjca]

I have a Netgear Nighthawk R8300.  It worked well for a while then started to lock up, and would reset to factory defaults upon power cycling.  I've reinstalled the firmware to the latest version V1.0.2.136  (manually using a ethernet cable connection from host computer).  No improvement.  Spent 75 minutes with tech support and still no improvement.  Anyone know how to fix this?  

[plemans]

The latest isn't always the greatest when it comes to firmware. 

I'd try actually downgrading to version 1.0.2.130 over a hardwired connection. Then factory reset it and do a clean install (not from backup)