08.03.2013, 00:38
I don't know why the labels disappear without any code, but I guess it's SA-MP bug when the labels are mixed up. That is, having more than 1 label on the same vehicle. Sometimes SA-MP still mix up 2 vehicles as the same one, so you get 2 labels on the same vehicle. To solve it you have to check if the vehicle has that label first. If so, remove it and then create a new one. You can't assume the label doesn't exist.