For me, i did have the Stillen G3 fitted at the time but i had it on for ages before it started happening. In the end, it was a bug in the throttle map i had loaded with Uprev. My guess is that under the right circumstances, that buggy cell would be called up and the ECU doesn't like it so it reverts to failsafe.
It doesnt log any fault or bring on the engine light because to the ECU, everything is working as it should. The bug probably just calls for an invalid command, like an off the scale response.
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