start -up or contact key?

Hello, I have a problem with my vivaro, from time to time especially when I leave it one day without starting or I give it to the set and only the click of the automatic sounds, it is funny now, now I give it the first to the start -up and wiggle the van a little, and the start -up is running hard, I think it is from the contact key you think?

Hello, check the booting of the starter engine, and grease the caps of the axis of this.