iphone x 64 gb, battery was acting up after applying the first update (11.2.2), wouldn't go down in sleep but fall down in a matter of minutes (maximum 30-40 minutes SOT when connected to network whether wifi or lte) when woken up.
, has returned to its normal behavior after 11.2.5 update sorted out its mess.
Was concerned because the fault didn't show up after updating any of the other Xs.