I have just experienced this problem myself.[br]
I decided to try new batteries and they worked....Putting the old ones back in and it still worked....[br]
[br]
Conclusion:[br]
Removing Batteries would have been like 'Turning it off and on again'[br]
The red on/off button is known as a 'Soft' power button which its circuitry needs to have power to operate so the unit isn't fully off when you turn it off...so removing batteries really does turn it off and basically 'Re-Boots' the unit like you would re-boot a pc if some software hangs the pc....[br]