Both parties in a proposed class-action suit against Best Buy and HDMI cable manufacturer Monster Inc. are asking a Cook County judge to order sanctions against a man they allege is lying about his standing as a proposed settling class member.California resident Benjamin Perez intervened in Amy Joseph’s and Robert O’Brien’s September 2015 class-action suit against the companies, contending he filed a substantially similar lawsuit in California federal court — which was moving faster and more …