Please take a look in http://forum.step.esa.int/t/grd-border-noise-and-thermal-noise-removal-are-not-working-anymore-since-march-13-2018/9332/9
since 13 March ESA released a new version of the Instrument Processing Facility (IPF). The product is changed containing some additional noise vectors, naming etc. Snap team is working currently on that.