Ipad with IOS 16.3.1 won’t go to sleep mode after 2 mins itself + drains battery when not using

Hi there,

I know that there are those of you who experienced this or are curently experiencing this.

My iPad since last week won’t go to sleep mode + it shows in battery overview that when not used and closed it drains battery a lot (can be seen in home&lock screen).

Tried restarting all the setting + setting up new iPad and so far it didn’t work.

I set up 2 min time for iPad to go to sleep doesn’t work either.

Tried turning off widgets on main screen.

Tried chaning the theme.

iPad itself is brand new with 6months of usage.