@Daniel This issue is typically caused by vehicle motion during the flight not in a forward direction. The two options are re-fly the piece with bad data or send the data files to us for manual work. There is a service cost on that of $250/hour and that usually takes 2 hours of work to trim and delivery, but it may have a 2-3 day turnaround to get through the queue.
Another user had this issue in this post: PCMaster - Failed to find good IMU rotation
In this case our analyst was able to cut out the bad portion of the flight.
Just make sure all motions are forward and while landing you are not making adjustments in any direction as this can cause issues as well.