I believe the issue is caused when the pilot “over-handles” the controls during landing in gusty or “more challenging than usual” wind conditions and the resultant behaviour of the FBW flight controls is less than ideal. The problem (for Gulfstream and the owners) is that the FAA is requiring a line-by-line verification of the entire FBW software coding before approval - this because of the 737 Max saga… This is a very lengthy process and will take a while to achieve. I understand why current and prospective owners of these jets would be displeased.