The band encountered several setbacks through the second half of 2014. The August concert in Tel Aviv was canceled due to an armed conflict between Israel and Gaza. Megadeth was scheduled to appear on Motörhead's Motörboat cruise in late September, but withdrew because of Mustaine's complications following his cervical spine surgery. In late November, Drover quit the band after ten years, wanting to pursue his own musical interests. This was quickly followed by the departure of Broderick, due to artistic and musical differences. Ellefson denied rumors that Megadeth would disband, and said he and Mustaine would continue working on new music. Mustaine said that one of the reasons for Broderick's and Drover's departure was the frustration caused by Megadeth's fan base demanding a reunion with Friedman and Menza. Lamb of God drummer Chris Adler and guitarist Kiko Loureiro of Angra were brought in to perform on Megadeth's fifteenth studio album.