Ubuntu 14.04 - Wifi keeps disconnecting on Thinkpad T450S with Realtek wireless adapter
I've had a similar problem on my Lenovo Y50 (rtl8723be), where wifi would disconnect with random intervals (between 5-10 minutes)
I found this thread that matched my problems: http://ubuntuforums.org/showthread.php?t=2262957
where user Pilot6 suggests to update drivers from this repository https://github.com/lwfinger/rtlwifi_new and it looks like it has drivers for your (rtl8192ee) card as well.
this stabilized the wifi connections for me at least
instructions;
#dependencies
sudo apt-get install git build-essential
git clone https://github.com/lwfinger/rtlwifi_new.git /tmp/rtlwifi
cd /tmp/rtlwifi
make
sudo make install
sudo reboot -n