Port Scan Attack is Logged- I suspect it is the router.

Every 5 minutes or so I get a popup that says port scan attack is logged.

The popup does not show an IP address, but when I look at the log, the IP address that keeps getting blocked is 192.168.0.1. It looks like that is the IP address of our wireless router. 

Two other employees at my office are having the same problem. Their computers are running on Windows 8. 

Does anyone know how we can fix this? Thanks!