Auto Save not working in Numbers, Page a Keynote - Sequoia 15.3.2 (24D81)

Beginning about 2 weeks ago the auto save function stop working as it previously had. Now I must manually save documents in order to preserve changes. The Apple help still says "The first time you save a spreadsheet, you name it and choose where to save it—on your desktop or in a folder, for example. Thereafter, Numbers automatically saves your spreadsheet as you work." Anyone else notice this problem?