When driving, when I hit a medium-light bump in the road and slightly jar the car, I hear a beep and the car goes into EV mode. This means the rpm's drop to zero, the gas engine shuts off and the car goes electric only. This is a problem because the state of charge then runs the bars on the multi-function-display down to the purple bar level. Also when I hear the beep, the MFD switches screens. This "short" in the system is reducing overall gas mileage and performance. Any clues where to begin to find the problem?