One of our A320's has an annoying fault. The IFE audio resets itself around 3-5 times in the space of a couple of hours. It is only off for a few seconds, then the chanel selector defaults to Ch3. If you are listening to another chanel you will need to re-select it again. The reading lights do the same thing.
Any tech people can tell why this happens as our technicians are baffled.