Since my Rokus (Three different models) updated, Pandora cannot keep login information. There is another thread in which Roku claims it is a Pandora issue.
I am also seeing this with MotorTrend app as well as Pandora. I have factory reset two of my devices and uninstalled and reinstalled both apps.
This seems less like an app developer issue and more like Roku made a change to their devices that broke a commonly used login storage solution.
Please fix this as it's extremely, extremely frustrating.