In order to troubleshoot your wireless network, you must perform a site survey with NetSpot. If you haven't used NetSpot before, first read "How Do I Start My Survey?" The first steps are to identify the area you wish to perform Wi-Fi troubleshooting on, and then upload a map of the area (or draw a map in NetSpot). Then proceed with your survey, taking data samples throughout the area. Once your survey is complete, you will be able to view heatmap visualizations of the entire area.
The Signal-to-Noise Ratio (SNR) heatmap will show you where your signal strength is not strong enough to overcome the existing environmental noise from other electronic devices. Areas of yellow are of concern and red areas are critical. If your wireless network troubleshooting scan shows SNR issues, you will need to consider raising your signal strength or lowering the surrounding noise.
The Low Signal Level heatmap will show you where your signal strength is weak. Causes of weak signal strength include too much distance between the router and the device, or something physically blocking the signal between the router and device. If your WLAN troubleshooting scan shows areas of yellow and red signal levels, you may need to explore ways to boost your signal level.
The Overlapping Channels heatmap shows your signal-to-interference ratio. This kind of interference is caused by other radio transmitters, such as your neighbor's wireless network. If your Wi-Fi troubleshooter scan shows red and yellow areas, you may need to change your network's WiFi channel to one with less interference.
If you do an active scan of your network, the Low Download Rate and Low Upload Rate heatmaps will show areas where your Internet connection speed is slow. If your troubleshooting scan shows red and yellow areas, you may need to consider boosting your signal strength or changing your hardware, protocols or bandwidth.