Okay. So I'm so over this problem, it's incredibly annoying, and I've spent 4 hours this morning trying to get  it working. It's insanely weird. I have the router from telecom, Thomson TG585 v8, that works on start up with no problem EVERY single time. On the other hand, I have a Netgear N300 which is near new, I much prefer this one over the Thomson for personal reasons, and that is a luck of the draw, sometimes it works, and when it does, it can work for up to 3 days or a week, or some days it disconnects a few times a week, the internet light turns red which to my knowledge is a authentication problem. It takes hours upon hours of restarts to finally get it to authenticate. What doesn't make sense to me is the fact that the settings on both of the routers are identical. I don't see the settings being wrong if it works the majority of the time. 

No offense to telecom, but they have been incredibly useless in this situation. I've called at least 25 times about this. Same answer all the time, please restart your router, call netgear, etc. Technician even came around, nothing.

I don't know what to do about it. The authentication is right.

user@xtrabb.co.nz
abc123

I'm desperate for help guys. All help is incredibly appreciated. This has caused me a great amount of stress. 

I'll provide any settings screenshots necessary.