VIP Deinterlacer jumping

Hi all

I use a motion adaptive deinterlacer with triple frame buffer

In my design.

When using frame rate, the output looks fine and stable for

A few seconds but then the picture start jumping up and down

And after a few more seconds it become stable again.

The above problem is cyclic, and nothing I do make the picture

Stable all the time.

The input source to the VIP is stable, and I follow the reference design

From Bitec, but not converting the video to RGB 4:4:4 (stay in YUV 4:2:2).

What is wrong?

Thank you in advance

Inon