Did you ask Andy if he could shed any light on this issue? Nellys helped some on the issue, It almost seems when large objects like a truck or when the NVR has to record a lot of scene changes(lots of activity) it gets worse with more or longer duration skips of time. If I have a semi dark parking garage with 1 person walking past the camera, i get very little or no missed time. I wonder if the processor in these systems are under powered and just not keeping pace with the change in events. In the daytime it does seem worse when the scene is brighter and more activity and the 3 other cameras are also recording too. This could be one possible explanation why everyone is having different hit and miss issues. Just a thought.Good news, bad news. I shut off "IPC time sync" in the nvr and the 1-minute changes on an IVS event have stopped. Doesn't change a thing for the skipped frames issue. Just a seemingly unrelated bug that's an annoyance but not a real problem for me. Chris FYI my nvr is from Andy in China.