As jeepdate says, the change down thing is normal when on cruise control.
Another quirk is when your using cruise control and knock o/d off before you hit a steep hill (so that it doesn't struggle half way up loosing speed and then change down too late). I find it drops 2 gears instead of one, then finds that it's over reving (as you expect from a diesel doing 110km/hr in 3rd!) and then shifts back to 4th, which is all it needed in the first place. Asked the garage and they say it's normal. Probably less of an issue with the petrol though as it'll have greater rev range.
Limiting the revs to 1500 and not pulling sounds like it's gone into a "limp mode" or something like that. Not heard of it happening before with the Wranglers but have heard of the same thing happening with auto boxes in other cars. The electronics detect some error and then basically close down to prevent you doing damage to the gear box. Might be soemthing else entirely but that's the only thing that springs to mind. If it is that then more often than not shutting it off and starting again will usually clear it.
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Silver MY10 JKU CRD Auto - SOLD - Now just loitering for the hell of it
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