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assuming they both live in the same country, and they worked fine for him the voltage switch should be the same (unless of course she has played with it). but to be honest, that would just blow up 
my guess is power fluctuations too. it sounds a bit too sudden to be a fault with eiter deck, how long is it since you gave them to her? if she is in an area with poor electrical supply, you can get a UPS box (uninterruptable power supply) which will keep the supply constant and would solve the problem, although i reccommend exhausting all other options because you wouldn't want to waste her money.
try moving the decks to another location, for example, your house. see if you get the same problem 
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MUGGETS
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