After crash reboot required fo discrete use of GPU

2 days ago I downloaded the DaVinci 15 public beta.
I'm so-so able to use it because of the frequent crashes. Everytime it does, I have to reboot my PC to be able starting DaVinci again. The error message is: "DaVinci Resolve is unable to run as the application was not able to initialize the discrete GPU.
Please ensure that DaVinci Resolve is configured to run in performance mode in your graphics card settings utility."
Well before the crash it does work, after the crash it doesn't.
I have an ASUS notebook with two graphic cards the Intel HD4600 and the Nvidia 960M. I run DaVinci on the Nvidia 960M. The drivers of Nvidia are current.
My OS is:
Microsoft Windows [Version 10.0.16299.371]
Somehow it looks like the DaVinci crash keeps processes running or not cleaning the memory.
What can I look for?
I'm so-so able to use it because of the frequent crashes. Everytime it does, I have to reboot my PC to be able starting DaVinci again. The error message is: "DaVinci Resolve is unable to run as the application was not able to initialize the discrete GPU.
Please ensure that DaVinci Resolve is configured to run in performance mode in your graphics card settings utility."
Well before the crash it does work, after the crash it doesn't.
I have an ASUS notebook with two graphic cards the Intel HD4600 and the Nvidia 960M. I run DaVinci on the Nvidia 960M. The drivers of Nvidia are current.
My OS is:
Microsoft Windows [Version 10.0.16299.371]
Somehow it looks like the DaVinci crash keeps processes running or not cleaning the memory.
What can I look for?