Most of the times the problem is that someone sees a adv engi running in a building and he got a character worth 1000 cr
or he's in a tank. He won't change it with an engi to repair the bombs. Building destroyed.
And those people that ruin the mines. Placing them everywhere but not on the right place.

If someone says building needs repair press the [J] key so you can see if it really need repair. Look at this often. Also do this if your gonna shoot a building press the [K] key to look if a building already got damage.
And only say building needs repair when they need it.

And for those i need repair messages do this ones OR JUST REPAIR your OWN vehicle.