Hi @TammySueS
First, are you asking as a teacher of a student?
Grades do not disappear from the Gradebook, ever! I have been using Canvas since 2012, and have been a Canvas Admin that entire time, and I have never seen grades disappear from a gradebook. In fact, it is very, very hard to purposefully delete grades; although I have seen it done.
Without looking, I suspect that you or someone else reset your course, one of the few ways you can clear a Gradebook, not to mention the entire course!
If you are a teacher, then you need to turn in a Support ticket pronto, they may be recoverable. Click Help, then choose "Report a Problem".
If you get it figured out, come back and let us know. It could be helpful to others.
Good luck, and I mean that with all my heart!
Kelley
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