Quality Breakdown Upon Gif Exporting


Although I am working with high-resolution source material (1080p), there is a breakdown in the quality when I export my cinemagraph as a gif. The background shakes and blurs (happens when it is masked/unmasked). I have tried adjusting the size of the gif (working with the range selector of 10-100%), and there seems to be no way of resolving this issue. Can anyone here offer insight? Thanks for your help!