Browser Freezes, Pages Go Blank

I have the latest version, and no extensions installed. After about 30 minutes to an hour of run time, Brave tabs begin to freeze, no input response, and tabs are blank/black. This happens on multiple tabs, regardless of the URL. For a while I was able to “end task” of Brave, and restart, reloading all previous tabs. At times I would have to resort to rebooting my laptop. Now, neither of those work very long. I keep four windows open, each with a different category of tabs. When the browser freezes, my CPU and memory are below 60% utilization. I’ve suffered this for a year, but it became unbearable today, so I switched to Firefox.