Even though the virus definitions are up to date, I periodically get a W10 notification that they are not.
Why, or is there a way to turn these off?
May I ask for the screenshot that you are getting? There is a possibility that your windows defender is still working on the background even though that you have a bitdefender on your computer. you can double check the notifications here. but also try to double check if your windows is up to date.
Waiting for it to happen again... Will post screen shot.
Not happening any more.