bt878 images shaking up and down

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We are in a project where we are switching among 4
cameras using a single-bt878-based card, bttv.0.9.10,
Linux 2.4.20, and trying to get as many fps as we can
from each camera. 

>From time to time (very frequently) the videos get
shaky (up and down) and we assume the capture keeps
switching between even and odd fields.  Even though we
only ask for the top field. We have tried several
things (including both the mmap and read/write
interfaces) to resolve the problem. 

We are running out of ideas and wonder if anyone has a
clue for solving the charade.

Thanks,

Ricardo de Queiroz 

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