Still no idea that why and how this happened all of sudden. But here is the 2 Solutions I found which is working: Applying anyone will work
1. Comment these two - //define('DB_CHARSET', 'utf8') and //define('DB_COLLATE', '')
2. Use Latin1, ('DB_CHARSET', 'latin1')
However, I am suspecting some attacks on our sever where blogs are hosted and investigating into this.
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