My wife has 2 Nextbase dash cams for her job, I have installed them into her car; one at the front and one at the back. They are both running to the rear cigarette lighter which has one usb charger with two usb ports in it. Every time my wife turns her car on the dash cams work for all of about 10 seconds and then both of them flash the same message "insert SD card". I have used the SD cards recommended by Nextbase themselves and reformatted them in the cameras as well however it is still happening. When I first installed them, they worked perfectly well for about a week and then all of a sudden went faulty. Can you help me understand if this is something I have done wrong or if I need to update the firmware on the cameras.