Clearly there’s something wrong if a few people are reporting it. Until it gets solved, it could be a good idea to follow these habits…
- don’t have Bricks open in multiple tabs.
- disable autosave.
- don’t leave Bricks open if you go off to do something else, like edit posts, or make changes in elsewhere in some WP settings.
- avoid multiple users making edits in Bricks on the same site at the same time.
I don’t know the cause of the problem, but following those few things should likely reduce any chance of work being saved over / lost in the meantime.