I know how you feel. Pup chewed up the Wii motes at night. It might be that you've stopped with some of the training because your pup had been so good! That's what happened to me recently. Puppy has been an Angel for the last 4 months. She is 16 months now so I thought, yay maturity. But nope, she regressed when I decreased the structure. I noticed an immediate improvement when I picked it up again.
Use a more secure crate in an empty room/bathroom?