There are a lot of closed threads about “Tabs Disappearing” and me having had the issue at max 3 times a year.
I just found out, that when you use a tab suspender extension, and it does get an Update or if you have a Browser-Update, that this might cause all of your tabs to disappear suddenly.
I would love for Brave-Browser to have a built-in tab suspender where you could set your own suspend timings for tabs. Chrome does have a suspend function, but it seems that you can’t set your own suspend time intervals.
For now, I refuse to risk getting all my tabs nuked again. So I use the Sloth extension, which simply discards all tabs upon closing the Browser and doesn’t load them automatically after opening the browser again.