Audio skips back few seconds while video freezes

Hi,
We are running FMS 4.0 to stream on-demand MBR videos using the OSMF player. We have noticed that occasionally during playback the video freezes, while the audio skips back a few seconds and starts playing. Once the audio catches up, the video unfreezes and resumes normal playback.
Any ideas on what might be causing this and how to debug?
Thanks.

I looked at the logs and it does look like there was switching going on when this issue occured.
Could you expand a bit more on what you mean by "switching issue" and "exact same timelines" ?
Also, how could I go about verifying that the different bitrate streams have the same "timelines"?
Thanks,

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