Why would all my speakers quit working at once

Hello, it does sound like some kind of intervention of another source selection or Bluetooth or something like that. However, it's all guessing until a technician can have a look at the unit to see what's happening, perhaps perform a master reset of the audio system, including disconnecting your battery, leaving it disconnected for 15 minutes, reconnecting. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops