How can I get my Samsung S4 out of a boot loop?

[AC Question]

Samsung S4 boot loop stuck

My samsung S4 started turning off and on again by itself.Battery was fine, there was no swelling as well.But I bought a new one anyway, and it worked fine for a day.It has started doing the same thing now again.The battery seems fine. I have no idea what the issue.PLEASE Model is GT-19505 .It is not rooted.