This has been a chronic problem with AC
Sometimes notes are deleted but are saved in the deleted tab folder on your sign in screen. (This selection is at the top of the page where you first log in where you can choose LABS, CHARTS TO COSIGN, IMPORTS TO SIGN, DELETED ITEMS.)
I have also saved charts to other mailboxes.
Hope that help. I still lose one or two a month. I have my medical assistant double check to make sure the notes are done
Rick