It is my understanding that all routers support 2.4gh by default, and some are dual band and also support 5gh. Usually this will be visible by two networks showing up, one at 2.4, one at 5. I will try to move the power supply next to my router and try again. How would I log onto my router to check the frequency?You will have to log onto your router and see what frequency you are using. It will not work with 5GH.
Also see if you can see the M600 on the network. It took a few tries when I first set it up as well.
It seems like it is wifi related. I would suggest bringing the control unit into your house next to the router and see if it can find the network.