As obvious as it sounds, make sure your battery isn’t empty. From our experience, that is most likely the culprit. Try plugging into a power source and see if this helps.
You can also try resetting the Karma Go. There’s a small reset button located next to the charging port. Use something like a paperclip to press it.
If that doesn’t work either, or if this happens frequently, reach out and we can work to see what may be going on.