I used Ubuntu 12.04LTS. I have met the same problem. the Kernel version is 3.5.0-48-generic. I rolled back to 3.5.0-47-generic. It has the same problem. But the problem disappeared when I rolled back to 3.5.0-46-generic. So I guess it is due to kernel upgrade.
btw, I also used rtl8192ce driver.
I used Ubuntu 12.04LTS. I have met the same problem. the Kernel version is 3.5.0-48-generic. I rolled back to 3.5.0-47-generic. It has the same problem. But the problem disappeared when I rolled back to 3.5.0-46-generic. So I guess it is due to kernel upgrade.
btw, I also used rtl8192ce driver.