Comment 78 for bug 1240940

No solution but here's the workaround that finally worked for me... (Ubuntu 14.014 stock kernel)

Download the latest driver (you might have to install git first):
git clone http://github.com/lwfinger/rtlwifi_new.git

Change into the new directory you just created:
cd rtlwifi_new

Compile and install the new driver:
make
sudo make install

Edit the settings for the driver:
echo "options rtl8723be fwlps=0 swlps=0" | sudo tee /etc/modprobe.d/rtl8723be.conf

It's probably a good idea to take a look at that file to make sure that worked. Some people say the "swlps=0" part of the command above is unnecessary. I'm not sure but it doesn't seem to be hurting anything.

Reboot.