It is falling at an unnatural pace because both China (which it agreed in previous government) and Saudi have refused to roll over their deposits under the current regime.
America wants the stooges to fulfill their commitments ( that's why the DG ISI flew to Washington to further the proposed security agreement, the visit of Pakistani delegation to Israel with a state TV anchor and led by close aide of Maryam Nawaz, pacifying hostilities against India) before it will lobby for IMF. Currently these clowns do not have the will to deal with IMF the way previous government was doing ( last tranche was released in Feb this year) . All their bets are IMF will simple grant them easy cash like it did after the first American sponsored NRO (PPP era package right after it came into power and as a result Pakistan was flooded with every asset from CIA to Blackwater ).