Q: Whenever I leave my iPod unused overnight, when I turn it on in the morning, it seems to perform a soft reset (the Apple icon appears). Is this normal, or should I have it checked?
A: Don’t worry, your iPod is behaving precisely as expected.
For power conservation reasons, Apple’s iPods have various stages of “sleep,” where the iPod puts itself into varying degrees of low-power operation. The specifics of these modes actually depend on which iPod model you’re using, and are explained in full detail in this Apple support document.
Essentially, your iPod is not undergoing a soft reset, it’s merely returning from a low-power mode..