I already have a CMX title, will I lose it if I don't pass in another edition of the CMX Level 3 exam?

You will not lose your CMX title if you don’t pass another CMX level 3 exam, as long as your CMX title remains within its validity window. Your CMX title will expire three years after the date in which you received your CMX results by email, unless you pass another CMX Level 3 exam before the expiration date.