1. Amrit Sanchaar is not the end, it is the beginning of a journey - its your admission into the Panth. 2. The failure of trying to understand Gurbani and implement it in your life. Don't misunderstand me, but what is the use of reciting Gurbani if you being a judge (job) do not serve justice? If you being a police officer take bribe? These are just examples of things which are clearly mentioned in Gurbani but many do not know or ignore on purpose. We have understood the importance of listening and singing Gurbani but understanding and implementing is not encouraged as much.
3. No one but Akaal Purakh is perfect, so don't expect to never fall prey to the vices. Many GurSikhs during times of Gurus made mistakes, sometimes huge, but they were forgiven or repented rightly. Remember even the Muktay, who had darshan of Guru Ji in Partakh Roop, deserted him at one time? Instead of keeping thinking of a mistake you might have made, move on after doing Ardaas and take a vow not to repeat it again. If you keep falling prey to the vices, then its another story. Then it might be time to change your environment (thats why the company of good people; Gurmukhs, is encouraged in Gurmat).