We have a Netgear ProSafe FVG318 Router Firewall at our office network, and almost daily it will require a reboot in order for the wireless and sometimes wired connections to work properly.  I see activity and can connect to the router admin, and there appears to be nothing really wrong other than I can’t connect to the internet which this router facilitates as it is connected to another router upstream.

I have read about:
The firmware version offered FVS318 was v3.0_26RC1. You could ask if there is a similar version for the FVG318.

You could also confirm ware the connection is dropped, presumably between router and modem, by using IPMonitor (now NetGong) and monitor a LAN IP, the Netgear LAN IP, the ISP’s gateway (assuming it responds) and an Internet IP such as 4.2.2.2
https://netgong.tsarfin.com/

 
Netgear ProSafe FVG318 Router Firewall Requires Reboot

System Name: FVG318_NETGEAR
Firmware Version: v2.1.2-67N