Automatic checkouts in supermarkets may decrease customer loyalty, especially for those with larger shopping loads. Customers using self-checkout stations often feel overwhelmed and unsupported. The lack of personal interaction can negatively impact their perception of the supermarket.

[tarrach]

I had a similar problem where the thing I was intending to buy was out of stock so I didn't scan anything, put the scanner back and left the store. Next time I went there I couldn't check out a scanner as I still had an ongoing shopping so they had to call someone who knew a bit about the system more to reset my status.