I think he means that the 10.0.0.0/8 addresses are reserved for private networks (similar to 192.168.0.0/16 that we see in home networks) - which is true however there is no reason why this would cause the problem the OP is seeing.
I think the posible problem here is the way the wifi is handling the connection and possibly due to local interference is causing an 18ms delay between the PC and the router. Just my thoughts.