NVR Cameras loose time setting on reboot


#1

1ea 8 Channel Security NVR (ZM-SS7009D8-S)
4ea 720p Bullet IP Network Camera (ZM-SS78D001-S)
4ea 720p Bullet Dome Network Camera (ZM-SS76D001-S)

Using Zviewer, I can make all cameras sync the same time. The following morning ch 5 & ch 6 are 1 hour behind. Ideas?