Yea technically it is an easy fix.
The reason why the device goes offline after 2 days was because of the lease time.
The wifi router is like a DHCP server and the default lease time is 2 days for me and when I increased it to 7 days it stays that long and or course you can reboot the router on the 6th day,
You can either remotely reboot the cable modem or call Comcast to do it.
Maybe there is a feature in the Zmode device setting where you can click Reboot on the device and it will get a new IP
There you go...easy peasy fix,
Zmodo- maybe you can send me another pivot camera for my contribution to the solution for the problem...many users are experiencing.