Hello. help us figure out what our problem is . we have NVR TruVision TVN-2232P. problem : when it is completely disconnected from power, does it not save the configuration . We have exactly the same NVR in the other place and when we disconnect it from the power supply or reboot all the settings are reset to factory settings. just like the other one . we replaced the battery (100% working) , updated the firmware from website to the latest version , then i reset the settings to factory defaults and set everything up again and saved everything . but as soon as I reboot the device or disconnect from the power supply, all settings are reset to factory settings . both devices have this behavior. please help me understand . this is a device problem? If not, please advise what I should do to fix this . waiting your reply . thank you in advance .