iPod nano Gen 7 - stopwatch goes to black display

Hi there,

I bought my iPod nano with the objective to take it to my training sessions, using the stopwatch.

But now, when starting the stopwatch, after 5 minutes, the iPod screen turns to black.

I didn't find any settings to prevend this.

So I have to click the home button every 5 minutes to see the continious stopwatch time - that doesn't make sense to me, and it's annoying during a training session...

It's very uncomfortable to interrupt my training sessions to reactivate the iPod display every 5 minutes, and the battery lifetime doesn't care in this case...

Does anybody have an idea for solving this...?

Thanks in advance,

Lorenzo