Well, there is always duct tape!
Seriously, you may need to take it off and reapply some vinyl glue. If you can't re-attach it, you may have to replace it. Fabric stores often have sheet vinyl goods -- you could cut it to fit and then use some heavy duty 3M adhesive spray. Be sure to use a lot of masking tape, and wear a good dust mask. That stuff works, but it is difficult to clean up. Don't get it in your hair. Please do not ask how I learned that lesson.
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