When I started racing many many moons ago, 30 years ago to be precise, people did talk about crystals going off, but as far as I know, the crystal itself simply contains the crystal and the resonant frequency circuit, in fact, the actual 'crystal' is probably the same quartz in every crystal and the oscilation circuit is different which defines the actual frequency. If that is the case, i find it hard to believe they could go off, though could be physically damaged or damaged by prolonged exposure to high strength magnets (the oscilation circuit that is)
But never let doubt or conjecture get in the way of buying new and shiny kit. You need 2.4ghz as you are less likely to get interference, or someone on your channel which could cause you to crash which could cost you twice as much as the cost of a brand new set.
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