Good day
i had the same experience with Vantrue dashcam, i this is not the only problem you may face ! , after one week the dashcam started to lag and keep restart, i return it back to the seller and got another brand
i is the only safe connection to connect in cigarettes lighter fuse in internal fuse box
try to change the dashcam with one with internal battery to remain working even the car power off , also to keep car battery safe
this is my experience