|If it is only that laptop, try restarting that laptop, sometimes this helps.|
You can reinstall the hardware drivers for the laptop from the manufacture's website and this might help.
As an alternative, you can purchase a USB plug in Wireless Network Adapter and use it for the laptop but make sure that you disable the original Wifi in Device Manager when you do this. My daughter's laptop recently had a reliability problem with her wifi and this solved the problem for her. Not as convenient as the built in one but serviceable and no more problems.
You have to be a little bit crazy to keep you from going insane.