I have a controller CR100 which is frozen showing a blue screen. I have tried several time to reset it with the mute + music buttons, but when the unit comes back up it stays on with just a blue screen. I tried to let the battery die and recharge it by putting it back on the cradle, but this did not work wither. I tried all this on the other CR100 in my possession that still works fine at it reset correctly: after the blue screen the Sonos logo appears and the unit eventually shows the menu. I read about a tear down removing the battery, but I don't feel confident with this, also if the warranty has expired and I don't think this will fix the problem anyways. This issue did not happen because of an update or because the unit fell or any damage.
Does anyone know how to fix this?