The vehicle was parked, not running in a shopping center. The trunk was open and I was putting groceries into the trunk. The trunk started to close while I was leaning inside loading groceries. The trunk did reverse up only after it hit my back, quite hard. This has happened to me three times, each time injured a part of my body. No sounds were made to alert me the trunk was closing while leaning in it, I will be finally report this to Honda. No insurance claim has been made