It happens me every 5 or 2 years.here.(I sometimes want to be obscure about my country for anominity..)Mental Disability check needs to be re-examined every 2 years,or 5 years,depends on how severe.Also,standard of getting disability check changes sometimes.If you fell off Grade 1 and Grade 2 disability,It means no Check.
Troubling thing is,it doesn't mean that person's mental illness is cured or Getting better.
Disability Class Table system is changing because there's so many mentally ill people.

Justafriend,you'll be ok you're already approved.don't worry.

Even for us,troubling part is paperwork."write me like Grade 2"happens sometimes.