You may drop "kung", unless it carries the conditional "if" meaning. Kung minsan nagagalit ako. = At times I get angry. Minsan nagagalit ako. = At times I get angry. (Kung) Minsan nagagalit ako pag gabi na siya umuuwi. = At times I get angry when he/she goes home late (at night). Kung minsan nagagalit ako, pasensya na lang. = If at times I get angry, just indulge me. (In this case, you cannot remove the "kung" because it stands for "if".)

yes it's okay to drop kung.

That's fine to drop the "kung" :)