I have 2 3yr old dogs, GSD and a Lab; both well trained in the house and both still crated when we are out.
Recently in the past few weeks, my GSD has been living up to his nickname in the home - troublemaker - by getting into the occasional thing even with me in the next room. Schedule changes have made it somewhat difficult to get in the amount of training and exercise he needs so he, being as creative as he is, found ways to use his mind by finding ways to entertain himself. I got his exercise back up to the level he needs and things settled back down.
For your dog, use the run; safer for him and your home. Up his exercise and training, you may think it is at a good level, but he is telling you different. I know with mine, the cooler weather has increased their energy level.