Thing ive heard with Oranges is that some of them fail-safe, and some of them dont. Seemingly unrelated to what model it is, but rather just how that particular receiver behaves.

I have two oranges, supposedly the same model but ones alot more sensitive and trigger happy than the other. Its led to alot of misfires which seemed to correct themselves when i switched the receiver around with the other orange.

Sorry i cant help fix the problem, but if no one else can help its abit of experience to say its not just you it happens to.