Dahua NVRs motion record with scheduled record skips frames

I have installed now around 16-17 Dahua systems with NVRs 4108 and 4116, couple with 5276 NVRs too.

Normally I set them to record all channels 24/7 plus motion detection to record the channel where motion is detected.

That way I can see continuous green timeline with yellow marks where there has been motion. This is useful when you can spot the

motion and easily play all the video before and after - because motion detection does not detect everything.

The problem seems to be, however, that when NVR starts recording motion over normal record, it sometimes skips frames, even

1-2 seconds may be off.

Anybody found a cure for this or do I have to switch off motion record and just search "blind" over the timeline?

Example video, skipping 06:12:10

That looks more like a compression thing.

I would make sure the camera and NVR are up to date on firmware.