Hi @shekharsmn90,
Did you perform any change that could explain this issue? Maybe a set of plugins? Also, did you check if there are suspicious access to your site?
You can check if there's a suspicious IP address sending a lot of requests to your server:
tail -n 10000 /opt/bitnami/apache2/logs/access_log | awk '{print $1}'| sort| uniq -c| sort -nr| head -n
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