I had an issue once when I was doing a write, something happened when the bin was loading with hp tuner, and the software got stuck in loading mode, wouldn't ever finish. I ended up turning the car off, having it towed home and then I unhooked the battery 15 minutes, after I hooked the battery up and tried to load the software it took the tune just fine. I attribute the whole thing to a glitch between my laptop and the hp tuner software.