I've also just started having this issue with the Pandora Windows app during the past several months. It previously didn't require me to log in more than once, but now it seems that every other time I start it, it shows the blue "Pandora" screen and just hangs. I have to close it restart it, then it prompts for login. I log in and it works fine. If I close it and open it later, it's a 50/50 chance it will hang on the blue opening screen and have to be restarted and then I have to log in again, or it may just start properly with me logged in already. I already did the clear cache/restart option, then reset app data option, then uninstall and redownload/reinstall the app from the MS Store, and it would work for a short time. Then, perhaps a few hours or a day later, it would hang at the blue startup screen again I'd have to close it, restart it, and log in again. FWIW, I don't ran any antivirus or registry cleaner software other than MS Defender, but I don't launch that on a regular schedule to scan or anything -- I assume it's always running in the background in some fashion; whatever the default mode for it is.
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