AC750 wifi Range Extender - connected to wifi router then dropped indefinitely

I purchased a Netgear AC750/Ex3700. Out of the box i followed the instructions connecting with web browser set up. i couldn't get it to connect to the router. I tried numerous things. I finally rebooted my wifi router (hitron) and finally got the Netgear to connect and start extending my wifi. 3-4 hours later it lost connection, and now won't connect to my router again.

I don't have a WPS option. but shouldn't need it. Web browser set up appears to be all correct, and there isn't anything in my router control panel to suggest it is ignoring the repeater.