My solution
After installing the latest version of the Intel wifi driver (www.intel.com/p/en_US/support/detect/wireless), uninstall the software/driver that keeps the wifi awake from 15 to 15 minutes when the pc is in Standby, and then install the Intel software to manage the connection (https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=21999, but do not allow that Windows manage it. A green icon of Intel ProSet Wireless will appear near the clock. Only it which stabilized my wireless and stopped falls. It gets out when the notebook is supended and quickly returns when wake it.
Good luck