Aus- Telsta Netgear Nighthawk M6 Pro - Ethernet port auto shut down even during usage

I too have been having this INSANELY INFURIATING issue. I am on my Mac all day working on graphics, edits, etc and in the middle of working my M6 keeps sporadicly completely shutting OFF or rebooting. Ive tried everything you mentioned as well as removed battery and run the box on direct power supply. I have my M6 connected to a mesh wifi system to provide service throughout my business building and it has worked well until this week. I finally lost me crap and called AT&T and LUCKILY I still have warranty remaining. The device I currently have is my SECOND device as the first had to be replaced due to similar issues. I think this model is just JUNK and I will be upgrading as soon as I receive a non defective replacement.