Mine defaulted again after like 2/3 weeks and then continued to work again. My Router never gets unplugged though. The one time it did go back into this fault was when I restarted it.
I am not certain why it fails like this. Somewhere I read that it is because the router connects to another...
The 3G/4G process with the arrows included worked for me after a day of troubleshooting methods from Axxess support. Only option I was told after these steps was to log a fault with MTN so I would eventually get a sim swap (weeks later?). Support suggested similar steps, just without the arrows...