|If the issue is isolated to one or two laptops/computers then the problem is likely to be the wireless interface on those devices. |
You'll want to start by troubleshooting the wireless interface on them. I would suggest checking to ensure you have the most up-to-date drivers for the wireless interface.
With a Windows based PC, if the above doesn't fix the issue you can try removing the device from control panel and rebooting to let windows "find" the device. Ensure you're installing the most recent drivers when you do this.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.