1998 Honda prelude automatic transmission with a h23a VTech dohc motor

You could have an electronic issue or a mechanical issue. Unfortunately, it is not possible to lead anyone through a diagnostic process in this forum. You'll need to obtain some assistance to someone who specializes in Honda's or transmissions or both. They can help with testing and let you know if you have a larger internal mechanical concern, or a repairable electronic concern. Since this vehicle is OBD II, you should be able to monitor data using a high quality diagnostic tool with monitoring capabilities.