HALIFAX customers are reporting being unable to access the banking app.
Customers say they're receiving error messages while trying to open the app or are unable to make payments.
More than 1,000 reports have been made on Downdetector, which monitors website and app outage.
Dozens of people have been complaining about the issue on social media too.
One customer wrote: "@HalifaxBank Can't log in using the mobile app? Is it down?"
Another said: "Unable to log into the app now for several hours… same error code!"
A third person added: "@HalifaxBank app won’t allow me to make any payments, logged out a few times, now can’t get back in - what's happening, seems to be an issue as other people tweeting."
Earlier this morning, Nationwide customers were hit with tech issues that left them unable to receive payments.
Customers first complained about problems last night, saying their payments had been listed as pending in the mobile app.
More than 200 complaints were logged on Downdetector but Nationwide now says the issue has been resolved.