Both, actually... When I turned the key on, I usually got a full cycle open, then closed, then this odd, spastic sound almost like a short as the VBoost kept moving back and forth for a bit... Took me a while to figure out what it was doing (finally got down with a flashlight and watched the process).
Before noticing the odd cycling, the bike would randomly surge, miss, and generally act strangly at cruising (throttle steady) above 4-5K RPM.
Finally, I turned the key on while holding the VBoost controller in my hand and found that by flexing the circuit board very slightly (or tapping it) I could make the VBoost move all over the place. Attempted the resolder and wireloom fixes, but ultimately bought an adjustable controller from MicroMachines and have never had the issue again.
Great information.....thanks!!