I have exactly the same problem flashing at high acceleration or speed change.
This has been reported to KTM France in August 2013, I was told that there would be an update of the software of the motorcycle.
To date, after several stimulus nothing has been done.
Here is the response of service quality:
"This is called ESS and is controlled by an electronic unit of the motorcycle, after contact with the plant I have just been informed that some motorcycle have a bug in the software of this function and flash fire stop becomes too sensitive and turns too quickly. A software update should remove this bug, "
Forgive me for the translation of this post made with google because I do not speak English.