Financial market operator CME Group Inc (NASDAQ:CME) is trading flat at $281.10 at last check, after the Chicago Mercantile Exchange's CyrusOne branch suffered a cooling issue at a data center. This triggered a shutdown of all options, futures, and fixed-income trading, which resumed at 8:30 a.m. ET.CME has been attempting to recover from its October lows near $260, bouncing off the 80-day moving average just last week. CME has held its own in the long-term, however, with the equity now sporting a year-over ...