He says one of the big reasons was Slash's divorce. He also talks about a rumor that Duff is giving Slash money to help with the divorce. The entire episode is worth a listen, but if you just want the GnR parts, it's around the 48:00 mark and picks up again at around 55:00.   http://billburr.com/thursday-afternoon-monday-morning-podcast-12-8-16/