One single association value was deleted from database automatically

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We have 2 entities associated with each other and have hundreds  of objects of in database created and stored along with one attribute where association object is stored.  Recent only one single association value got deleted from database without any log or error.  Also not able to reproduce it in local or development environment.  Is there any solution to find out how that only single association gets deleted .  
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1 answers
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Did you check my answer in 139411:

Sounds like your database is corrupt. Check your database, find your 2 entities, likely they have the same value in attribute submetaobjectname. As a result they share the same generic object, thus getting your decribed symptom.

To resolve this the simple way: delete them, if you can, and recreate them one by one. Likely deleting the second will throw an error, since its generic object has already been deleted.

To resolve it in a more complex way: create a new generic object, use SQL to add its id to the submetaobjectname of one of your two objects.

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