Hi, the problem happens either when running on battery or with the power 
supply. I tested with 3 different kernels:
 3.11.0-12-generic
 3.11.0-13-generic
 3.11.0-14-generic

The last one seems the more "stable" though the disconnect are frequent.
I tested also the latest v3.12 kernel (from 
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-saucy/ *not* trusty), to no 
avail. Actually, with the 3.12 saucy the system became extremely unstable, with 
crashing of network-manager at boot time and preventing also running the X 
server.
As a stopgap measure, I'm using a small script:

service network-manager stop
rmmod rt2800pci
modprobe rt2800pci
service network-manager start

that somewhat is useful to recover the WiFi support.
Sometimes, when the connection drops and after a variable period of time 2 - 10 
minutes, the wifi support seems to auto-recover, but in that case I'm never 
able to see my access points (they aren't listed in the Unity menu), but I can 
see "foreign" APs from neighboring offices. I still cannot connect to those APs 
(either because I have no credentials or because the authentication method is 
not WEP).

I will test the 3.12 trusty kernel and report the outcome.

Than you for the support.

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https://bugs.launchpad.net/bugs/1253997

Title:
  WiFi randomly disconnects

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