Battery Drains by 30% - 40% After Shutdown and then rebooting it again!

Since like a week ago my Samsung Galaxy J5 (2016) (which I almost have 1 year) is acting real weird battery wise, I can easily use it throughout the day but at night when I power it off and power it back on the next morning it loses like 30 to 40% battery life for no reasons whatsoever is this a bug or something? or is there something wrong with my battery? Also a heads-up I ordered a new battery for my phone 2 days ago and received it yesterday but the problems seem to have been acting up on the new battery too which is why im posting this, Because I thought maybe my battery was old and about to die so I bought a new one but that one does not seem to help in any way as its having the same problem!

If someone could help me out here!

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