First, welcome to the board. You will find this to be a valuable resource.
Let's start with what you mean by "shutdown".
Are you having troubles starting it? Is so, have the usual suspects been checked? clutch switch, sidestand switch, gear indicator, ignition switch (big source of problems on earlier models), kill switch. When you turn the key on, do the headlights come on?
Have you checked the snugness of connections under the tank? on the starter? on the battery? (yeah, obvious but you would be surprised)
Did the bike "shutdown" while riding?
Do you have any indication that it is experiencing a major engine mechanical failure?
I know that you are quite frustrated at the moment but if you can spend a little time describing the symptoms, there are a number of very experienced wrenches on this board that can probably help.