Hi Klaus,
you've probably done some of this already.. do let us know what you have tested.
Did you restart the NVR?
Check the logs on the NVR?
Check the logs on the Camera?
Double check the settings?
Did the NVR update the firmware?
YES to questions 1, 2 and 4. The log showed no unusual entries from July 1 to July 31 except for "IP Camera Disconnect" - D2 on July 17 at 07:36:01. Then I swapped camera cables around amongst the channels and the others showed "Disconnect" and then "Start Record" as they came back up - all except channel 2 (D2). D2 showed "IP Camera Disconnect" again at 7:36:55.
I double checked all settings - as I said, all cameras and ONVIF streams were working perfectly for many days. Connecting my laptop to the POE segment and giving the camera's IP
ort allowed full operability of the camera.
Regarding question 5, I'll check the camera's logs when I'm back on site tomorrow morning - I need to be directly connected to the POE segment. I'm also going to switch one of the working cameras to channel 2 to see if the problem moves around. - I did that but I can't remember the results.
Question 6: I did not update it and, I don't think, it would do so on its own. Unfortunately, I did not record the firmware version when I first opened the box.