Screen freezing/blacking out when editing

First time on a forum, so if any more information is needed, please ask and I will happily provide!

During my first download of Davinci Resolve (16, I cannot remember the specific version), there were no problems, even with heavy editing and scrubbing.

After a problem in which I could not get Davinci Resolve to start, I deleted it and clean installed the version which I have now (16.2.8.005) and ran it as administrator, causing Windows to run the compatibility check which solved the problem. I assume Resolve now runs under Windows 8 because of the compatibility thing...

Resolve is now able to open and I am able to access my projects. However, with light editing, the preview becomes a black screen, and even if the playhead is on a clip, the video is still black. I am still able to drag the playhead along the timeline, but the preview remains black and I cannot play it. Pressing spacebar or clicking play in the viewer does not do anything, and the playhead remains where I left it.

This problem occurs when I "lightly" edit, like add photos to the timeline or cut and transform clips. It usually happens a few minutes after startup, to which I try to restart Resolve. Opening Resolve solves the problem and I can see the preview and edit for a few minutes until the preview blacks out and I can't play the video again.

Is there any way to solve this problem? It's strange because when I installed Davinci Resolve for the first time a couple months ago, editing was squeaky clean and no problems arose. But now...

Thank you for your help!

I assume Resolve now runs under Windows 8 because of the compatibility thing...

Bad assumption. Update to Win 10.

Install and use Resolve from an Admin account.

I have been using an administrator account to install and use Resolve

Using Windows 10?

Yes. I only mentioned windows 8 because it was mentioned when compatibility mode was used to fix my previous issue of resolve not opening.