WordPress ‘repairing database’ in a constant error loop?

WordPress in a constant error loop.

When I try to log in I’m told to repair the databases.

Here is the sequence

1. Error reports: “One or more database tables are unavailable. The database may need to be repaired”

2. I follow the command which is to add this to my wp-config.php file define('WP_ALLOW_REPAIR', true);

3. I do the above and the database is repaired, and as instructed I remove and command added above; try to log in and the loop continues…

Any idea how to fix this?

Thanks!