I was having the same issue. whatsapp was causing that in back-ups. turn off backups and turn off encrypted back-ups. it's looping infinity while getting stuck backing up things

seems like this worked! thanks

Thank you for your response, but it's too generic and doesn't address my actual issue.I'm not asking for general battery-saving tips. My concern is that my phone has recently started draining battery much faster than before and heating up significant...

let me check this... I will update if things improve

Thermal Guardian, good Guardian app