OK, well normally you're going to want to keep DHCP turned ON on your router so that as IP devices come/go they will get addresses assigned automatically. This is not what you want for the Apex if you're going to expose it to the web like most of us do.
There's nothing wrong with statically assigning IP addresses to all your IP devices like your PC, network printers, wireless cameras, etc. but it can be a bit of a pain if you frequently add IP devices (friend comes over with a laptop).
I think I would re-enable DHCP on your router, make sure your PC is set the same but turn DHCP off on your Apex.
If you then still have the problem then one of the network gurus here will undoubtably have some other suggestions/troubleshooting steps.