When I purchased this model I was told that the camera when using a SD card would automatically record from the beginning and over write existing SD card video. My SD card showed no data available and it did not start over. 
 

In addition the camera is located at a summer house in NJ and we spend 9 months in Florida and have no physical access to the camera 
 

I have a ScanDisk with 128GB memory. Everything was working fine when I left but now the SD indicates no storage available and it has stopped recording video