Ok, so the speeds are down from 18 mbps to 1.5 mbps. The tests in Xirrus looked the same except for the speed test which is down to 1.5 mbps. This problem is resolved if I unplug and plug back in my usb adapter.
Edit: Just learned that the problem is temporarily resolved when i reset my ROUTER also. Could it be these usb adapter and the router aren't agreeing?