Bootloop in Marshmallow M8SD indian version

Hi all.I updated M8SD to Marshmallow through OTA.Initially it works flawless.After some days boot loop starts.I've to lost all of my data to work(Factory reset through recovery).Now my device is rooted,S-ON and TWRP installed.What is the reason for bootloop and how can I get rid of It?

Thanks in advance.

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