2006 Buick LaCrosse loses coolant

every time they put in a small amount of coolant, the car gurgles and when it stops days later the coolant container is empty, this never use to happen and now it does, what’s wrong?

You have a leak somewhere. If you don’t see any coolant leaked on the ground, it could be a bad head gasket and the coolant is getting burned up. This is something you need to get taken care of ASAP