It's important to wax the string on your crossbow after every trip to the range or field. It's just as important to lube your rail and inspect your string and serving for any wear.
I also like to check all my bolts after every few trips just to make sure everything stays tight. And when it comes to important gear like the BMF Trigger activator , rope cocker etc. remember, two is one and one is none in the field, keep an extra in your backpack.