I'm thinking it might be time to warranty my audioengine A-5 speakers but I thought I'd ask here first to see if someone can help me identify the problem. I recently set up the A-5s in the master bedroom and they worked fine until they didn't,

. I'm getting some hissing and crackling off the passive speaker (the one without the amp). I checked the connections and they're fine. Any suggestions other than exercising the warranty?