I know this is an old post but was wondering if you ever learned what the issue was. I have a truck doing the exact same thing. I have found I can get it to happen consistently by traveling in one direction then while raising the platform, twist grip to plug. The same reaction happens. If I hold the grip to full throttle, BDI goes blank. Once throttle is released or I step off then right back on presence/brake pedal the BDI will re-illuminate and travel will be restored.