Welcome to the forum!
How do you have the speakers connected to system?
Do you:
- Have an amplifier/receiver connected to a Niles SSVC-2 speaker selector, with one output going to your primary speaker set and the other output going to speakers in your bedroom and outside?
- Have an amplifier/receiver connected directly to your primary speaker set, and the amplifier/receiver also connected to a Niles SSVC-2 speaker selector, with one output going to your bedroom speakers and the other output going to your outside speakers?
- Have it connected some other way?
If it's the second choice, then perhaps you accidentally turned off the amplifiers connected to the Niles selector (e.g. by switching off the "B" speakers on some receivers).
This is not intended as insulting - make sure that the volume knobs on the selector aren't turned all the way down (I'm sure that's the first thing that you checked, but I wanted to be thorough).
If you let us know that info, we might be able to help out more. In regards to your original question, I don't know if there are internal components that would suddenly fail in one of those selectors.