Are you following the first rule of development? BACKUP.
Every time I make a series of successful changes and think that's enough to potentially lose, a file with that date is saved, as in myDb02202019 and things go on from there.
You may have gotten rid of the messages by inadvertently saving changes you made by closing the db. Switching to form view after making changes doesn't mesh your changes with what's already been loaded and maybe that's what was going on.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.