Edimax EW-7811Un usb dongle dropping WiFi connection?

Is your wifi dongle going into power saving mode no matter what you do.
You turn off wireless power management from /etc/network/interfaces by adding the following line of code and it does not work

wireless-power off

Instead try this:
Create a new 8192cu.conf file (using the nano editor) in the following location

insert the following code

options 8192cu rtw_power_mgnt=0 rtw_enusbss=0

This will disable the power management and prevent the wifi (ew-7811un) from going to “sleep”.

this fix worked for me, thanks! using Rpi 2 (1 gb ram) , edimax EW-7811Un, volumio 1.5.
set up was easy but webUI and SSH would not connect after several minutes
now working flawlessly