This new version of Audacity (3.6.1) has a bug that makes the screen go blank right in the middle of recording and editing. It doesn’t seem to be on any specific distro or desktop. I’ve had it happen on Mint Cinnamon, and Arch Plasma. I’ve switched to the 3.6.2 branch, which fixed the problem. Though I had to clone, and compile it myself, which isn’t necessarily a straight forward process.