Nvidia Driver Needs to be Manually Selected

My Hackintosh has become unstable lately (spontaneous reboots) and one of the symptoms seems to be that when I start the system from cold, it constantly boots using the integrated graphics driver rather than Nvidia. I have to log in, go into System Preferences, manually select the Nvidia driver and reboot for it to work. Any idea of what could be causing this?

My system has a i7 4770K, Gigabyte GA-z97x-Gaming 5 mobo and a EVGA GTX 970 using Clover.

submitted by /u/davpel
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