How do i stop the Vendors from quiting ?!

ok..i have tryed everything it feels like.
2000 Dollars and maximum training. They are happy for a while, but take breaks all the time. And in the end they just quit.
It seems like if the very bored they want to quit faster.

If i could strangle them to death, i would.:)

I play in scenario. Is there anything i can do in the Menus that would help?
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