What do you mean by the "occasional poor wifi signal"? The wifi signal your laptop gets is very poor?
You know several factors, like the distance, physical blocks and interference with other high-power home appliances, really affects the wifi signal strength that you receive on your wireless devices. You may relocate the router to a better position and adjust the external antennas on it and see if this makes a difference. By the way, try different wireless channels on the router,