On the XP9303 and other "standard" systems (9X, 9XII etc) that area directly behind the stick wiring loom is clear. Therefore there is nothing for the wires to chafe against.

With the 2.4 GHz versions, that area behind the loom now has the 3.3V regulator sitting there ready to scrape against the cabling. If I was a 2.4 GHz user, I would inspect this area at least monthly to check for signs of damage. It isn't going to happen to every system as it depends on how the wiring loom is laid down.

I would hope that Horizon will release a product bulletin outlining the problem, together with an easy fix. I will try and get a system to experiment with. I'll try some bog standard clear tape first and see how that goes with the next stage using a thin sheet of flexible plastic fitted in position over the regulator to ramp out the sharp edges.

Contact your distributor if you have these issues soonest.