My cameras show up on initial startup but then after a few minutes I lose them. Rebooting the system fixes the problem for another few minutes but they ultimate disappear again. What is causing this?
The most likely cause of this issue is the recorder not having enough resources to display all of the cameras at once. This could be because the cameras are being set to output a greater resolution than supported, or it could be because too many cameras are running at a high resolution as, for example, just because a recorder can support an 8MP camera does not mean it can support every or even multiple cameras running at 8MP resolution.
To resolve this, enter Record -> Video Parameters and lower the resolution of your cameras until Live View stabilizes. You can determine the resolution capabilities of your recorder and how many cameras can be set to what resolution by consulting your Data Sheet.