Thanks buddy! It back to normal after Re-install Whatsapp.
I had the exact same issues/symptoms as mentioned by Rehaan13, saideb79 and others.
I had it fixed by re-installing WhatsApp.
As mentioned by others, "Android Core Apps" was draining the maximum battery. I took a backup of WhatsApp, uninstalled it, restarted the phone. Observed for sometime (about an hour) that the "Android Core Apps" was not draining extra battery and my contacts speed was back now and then reinstalled WhatsApp.
Things are all back to normal now.
Looks like a complex issue with WhatsApp, Android OS update or LG's OS update. Cannot pinpoint further. Not sure if it will work for all but wanted to let know others what worked for me.
Cheers,
Anirban
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