According to Robb Flynn , Adam Duce was unhappy after being in Machine Head for more than 15 years and having lost his passion .
4 days later , Robb Flynn revealed in his online blog that he fired Adam Duce because of ongoing differences and that Duce had become sick and unhappy being in the band for over 20 years citing that he had lost his passion a long time ago .
Machine Head -LRB-band-RRB-