1998 C230 Interior Electrical Light Problems

I don?t know why but the sealing switches for the interior lights aren?t functioning right. I press for rear light and it doesn?t turn on - but by itself maybe a day later? I press for the open door lights to come on but they act as the interior light switch that never shuts off until re-pressed. I open the cabin door and no lights turn on. I shut the car off at night and no courteous lights turn on in the cabin nor from the head lights. What needs to be replaced because the interior bulbs are good and work but nothing in order or proper function.