In the comment fields on Swedbank's social media, many upset customers ask what happened to their accounts.
Sometimes the balance is several tens of thousands of kronor minus.
SVT has been in contact with several people who have been affected by the problems.
According to the site Downdetector, more than 2,000 people at 23:30 on Thursday reported that they have problems with Swedbank's services.
SVT is looking for Swedbank for a comment