If you are up to it, here is a manual way of updating the nVidea driver. Version 295.53 just came out yesterday.
There is a link to download the driver, a link with instructions on how to remove the old driver and install the new one
and a 3rd link which you will need to do. It is a How to in this forum that creates a script to install the driver into any
new kernel that gets installed in the future.
I suggest using this manner to get your updates so you can see what is going on and whether the driver gets installed into a new kernel:
A very knowledgeable friend in this forum ranch hand calls Update Manager Update Mangler.
He told me to always use these commands to get my updates:
If there is anything held back like a new kernel install this will get that:
sudo apt-get update
sudo apt-get upgrade
Here is the link to install the new driver:
sudo apt-get dist-upgrade