Sometimes it's just a matter of turning off all Wireless, or even all networking, and then reactivating it again. With Windows, the equivalent is to disable the network device, and then re-enable it. In Windows, you may have to disable networking all together and then reactivate it. OR try reinstalling the network driver for your laptop. If this doesn’t work, go to Control Panel>Network and Sharing Center. There, check if the Wireless network card shows as disabled… if it is disabled, right-click on it and click Enable. Click yes on the UAC Window if prompted. Wait for confirmation that the card is enabled. You should see the Wireless icon on the Taskbar. Also, check the PC Settings ( Windows 10 ) and see if wifi shows up. Having issue then read '''Toshiba laptop won’t connect'''

As I read the above discussion. Just go for Scan Valid Interval to fix your wireless network issue. To increase your Scan Valid Interval: 1) On your laptop, press the Windows logo key and R on your keyboard to open the Run box. Then type “ncpa.cpl” and press Enter. 2) Right-click your Wireless/WiFi network adapter, then click Properties. 3) Click the Configure button. 4) Select the Advanced tab, then click Scan Valid Interval. Change its value to 120, and click OK. I hope this will fix. If still any issues then read WiFi Keeps Disconnecting