DJI .movs flickering off line.

so a few dji drone shots seem to play up recently. they play back fine in source but the timeline record monitor they flicker to red offlinemedia screen randomly.
they are not corrupted files.
they were brought in as full resolution files, the media attributes were chaned back to 24p from 60p as it was shot.
i tgen generated proxy media.
and still, either as proxy or full resolution files the same files flicker 'off line'
when they play back fine in other apps i feel i need to transcode them to 422hq to become working clips
any thoughts?
they are not corrupted files.
they were brought in as full resolution files, the media attributes were chaned back to 24p from 60p as it was shot.
i tgen generated proxy media.
and still, either as proxy or full resolution files the same files flicker 'off line'
when they play back fine in other apps i feel i need to transcode them to 422hq to become working clips
any thoughts?