Also The chinese fuel probably does not help is there a plug on the 990 like on the 950 which you de activate - for poor fuel running, this may also help.
Also maybe a drop in air pressure may cause symptom if the engine requires more air fuel than it can draw simply because there is a lowering of average air pressure and less density then the engine can not work as it would at lower areas - I would not have thought 4 /5000 meters would be outside the bikes operating capability but maybe it is try dropping an e-mail to ktm they might help as they will know what relevant flow rate is required to keep the engine running properly.
once again good luck.
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