MySQL tables got corrupted

I am getting this error in most mysql databases on the server (Linux/cPanel)

Code: 
There seems to have been a slight problem with the dbname database.
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After checking all the databases, it seem there are some tables got corrupted.

I tried this command:
mysqlcheck -A --auto-repair

it fixed the problem but it comes back again!

what's the cause of this problem and how can I completely fix it?

Thanks

 

 

 

 

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