Bridged Hitron Modem - Asus Router Goes Offline Randomly

[Klempford]

I have a high end asus router and a Rogers Hitron modem (in bridge mode). My asus every few nights will randomly go down (wired and wireless). Only way to get the router back up and running is to unplug the Hitron and router.
Any suggestions on what the issue is? I haven’t updated the Hitron firmware, could that be the issue? If so how do I update in bridge mode?

*Added Labels*

[Datalink]

No, the firewall stays up and running, both IPV4 and IPV6.  When you're done with the factory reset and the modem is set up and running, take a tour through all of the pages, and for items that you know you're not using, disable them.  I'm thinking of items like Samba, Traffic Analyzer, QOS of any type, Media Server, UPNP, Port Triggering, Port Forwarding, NAT Passthrough, etc, etc.  Only leave those items enabled that you know you're using.  When thats all done, reboot the router and save a backup of the settings in case you ever need to reload the router again.