How to fix Intel Wi-Fi Adapter disconnecting problem
Go to control panel -> Power Options -> Change Plan settings under the power plan you have chosen -> Change advanced power settings -> Make the wireless adapter settings to maximum performance.
Next, go to the device manager, select your Wi-Fi card -> go to Properties -> Advanced -> Set “Transmit Power” to maximum, and “Roaming Aggressiveness” to lowest setting.
Also, under the “Power Management” tab, remove the tick for “Allow the computer to turn off this device to save power”. And click “OK” to save the setting and reboot the PC.