windows crashing

I agree with copz1998 that updating your wireless card driver would be the first thing to do. You can find out the make/model of your wireless card from the device manager of Windows and go the Wifi card manufacturer site to download the latest driver (your laptop manufacturer may have already stopped supporting your device). 

However, the fact that this problem only started to occur recently suggested that something else more likely caused the problem.  Did you change the Wifi configurations in the gateway or reset the gateway shortly before the problem started to occur? I wonder if your old laptop is only WPA capable but your gateway is set to WPA2/WPA3 for Wifi authentication.