I’ve had my Wolverine V2 for just over a year and the M3 button broke.  After looking through the internet, this is not uncommon unfortunately.  It has a design flaw where the neck of the button breaks due to pressure on the button.  I contacted Razer support but they would not offer support because it was past the year mark for the warranty, annoying.  So I decided to fix it with my 3D printer.  If you are also past warranty or have a  broken one on hand and would like to fix your $150 controller, see video for details