Air outlet mode stop direct airflow to face, only to defroster and foot - Vent problem

The A/C sometime stop directing the airflow to face (register, center and side) and give a greater airflow to defroster and less to foot when I select the face air outlet mode.
when this problem happened I try to disconnect the negative battery cable to reprogramming the air conditioner but no changes.
and it is still for days then it is repair by it self when I switch on engine one day.
last days I note the problem happen more when I go to a places with high humidity.
i went to technician who change the upper lift servo motor (for face outlet door) but the problem still happen.

Note: when turn on the engine if A/C control screen show a blank screen (no temperature nor air outlet mode symbol shown for a while and (auto switch is light on) the problem will happen,
2- if the A/C control screen show the temp and symbol of air outlet instantly that mean the problem is sleep and everything will work well.