Jerky Video On Milestone VMS

I've been having jerky video on a Milestone Enterprise 6.5d system only on a recently added Axis Q1604 camera. Recording is done motion based at a 7 fps. However, both live and recording video are jerky. However, I understood that the jerkiness/jumpy (infact frame losses) is related to pre-event/post-event video times (3 secs in m case). When this was increased to 15 secs more frames are lost and more jumpy.

It seems pre/post event buffers are not working properly. Wonder if anyone could shed some light on this to alleviate the issue. What happens with the video is; it plays a chunk of activity (abt 6-7 sec) then jump to current frame instead of next sequential frame where motion is still happening.

Where is this pre/post event buffers are maintained; at the VMS RAM or at the camera it self?

Is the problem due to motion based recording algorithm? (All other cameras are fine, this particular one is not; WDR is off, FOV is very wide - a ware house)

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