Hello Atheta,
The issue you have appears to be related to power or compatibility. You may want to update your router’s firmware and disable the power management for the wireless adapter in device manager.
Please also check the following articles:
Intel� Wi-Fi Products; Power save polling (PSP) causes connection issues with access points
Wireless Networking; How do I improve my 802.11n wireless performance?
Intel� Wi-Fi Products; Access Point (AP) firmware updates may resolve wireless network issues