It happens for me as well but only sometimes. Usually bot does everything correctly till appears errors like:
1) "Captcha didn't found"
2) "You don't have valid API..."
3) "You don't have enough credits".
Then I restart bot and it runs again. Imho it is related with 9kW because there I got more than 50 error messages every day about not found captcha - maybe GF has changed captcha and it could be longer (sometimes - like I said)?
If you need any additional info, just poke me.