I let the SD card fill up, after which the system became unresponsive with "in it fail" message, and after standing for 48 hours the battery had run dead, as if the cam had not shut down. I've installed and formatted a new SD card and charging the battery now.
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Please unplug two cameras from DVR and replug, then restart camera system.
Yes, you can format SD card from the setting on App. 64GB or 128GB SD card should be formatted to FAT32, you also can format SD card on PC by blow software,
http://www.ridgecrop.demon.co.uk/index.htm?guiformat.htm
Once you get camera system to work properly, ignition off, the camera system will shut off accordingly.