Car dash cam problems

The only recordings that I am able to see are those when the car is parked and the door is opened or closed. I can not see anything once I start driving, no matter how long the trip is. I have my motion settings set to "Frequently." This feature did work for the first few days after I installed the camera and as the newness wore off I hadn't looked again until today. I am afraid I will have to send it back as I am half way thru my trial period.