This may be the cause of the problem you are facing. Sometimes it may happen is that Windows is turning off this device whenever it is going into sleep mode. Fix-14 Uninstall and Reinstall WiFi driver.Fix 11 – Buy an external USB WiFi Adapter.Fix- 10 Set the WLAN AutoConfig service as Automatic.Fix 8 – Change Wireless adapter by updating it locally.Fix 5 – Switch to high performance mode.Fix 4 – Change power saving mode of Wireless adapter.
Fix 3 – Disable 802.11n mode in WiFi config.