An easement may not be aggravated by changes in the condition of the prevailing yard, unless the deed of establishment shows otherwise. In case of aggravation of the easement by your neighbours, you can (if consultation with the neighbours did not work) request the court to modify or cancel the easement (art. 5:78 sub a Civil Code). There must then be unforeseen circumstances within the meaning of that provision. If your neighbours themselves have the possibility to make an adjustment in their own yard so that the easement is not aggravated, that is the most appropriate option.