I have one wired speaker and a few wireless ones. At approximately one quarter past the hour, every hour, the wired speaker cuts out for about 30 seconds. The wirelss speakers have no interruption. The speaker still shows in the controller and the time isn't exact; sometimes, for example, 2:16, sometime 2:18 but always around the quarter past mark. After that, it will cut out a few more times before regaining stability. I'm stumped as to why this is happening. Ideas?