Bank of Scotland, Halifax and Lloyds apps are currently experiencing difficulties with some customers unable to access their funds and make payments.
Lloyds Banking Group has said: "We know some of our customers are having problems logging onto Internet and Mobile Banking at the moment. We're sorry for this and we're working to have it back to normal soon."
They have said that the issue is only impacting some customers. They add that debit cards, credit cards and ATMs are also working as normal.