I have a 7616NI-E2 with 16 dome cameras connected, two of the cameras are doing something odd on playback on the GUI on a PC, on playback the red/pink motion detection bar at the bottom of the page stops displaying during a 24 hour period, the bar only shows black but the odd thing is that if you click on the black bar area the recording is their but not showing up as red/pink, it seems to behave normally from midnight to either mid morning or early afternoon when the coloured bar just stops even though the recording is being done, this is only happening on two cameras that have been updated to V5.5.0 firmware, also these two cameras did have SD cards installed which have now been removed and the cameras re-booted, anyone else come across this problem?