Linux agent
Ubuntu sometimes runs Overclocking sometimes doesn't
Have you identified if it's a specific GPU property (like Core Clock, Fan speed, ...) that cause the failures? The Remote Agent log file (can be accessed via the toolbar Tools -> Log File -> Remote Agent) might give further details.
Now when you download the drivers, yesterday update, there are two versions, the standard driver and the "creators" driver that is more stable and is more focused on intensive applications (photoshop, cad, lightroom), this is the driver that I use. Yesterday I installed it on a computer see. 419.xx and I do not have a problem.