Are they on continuous, or only when there are vehicles along side? If on continuous, I would think something is wrong with the set-up procedure, but a call to Buick/GM Customer Assistance (or a knowledegable dealer tech) ought to be able to help with that.
If they go on/off as they do in normal driving, i.e. when another vehicle is in the blind spot, I wouldn't worry.
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL