In cases like these, the dash cam is often too sensitive in terms of the G-Sensor/Parking Guard/Bump Recording feature so most likely the dash cam is saving all the files as emergency recordings which cannot be overwritten by the loop recording function. Please format your micro SD card on your computer then set your dash cams G-Sensor/Parking guard/ feature to low sensitivity or off for testing purposes. If you are still experiencing issues after adjusting the sensitivity, please contact our customer service team at service@mygekogear.com.