I get logged out each time I boot up the Mac. This only started happening after the recent update.
Try a clean reinstall of Spotify to see if this fixes the problem:
Advanced method:
https://support.spotify.com/learn-more/faq/#!/article/reinstallation-of-spotify
Easy method:
Download this free app cleaner. It's super easy.
http://www.freemacsoft.net/appcleaner/
When you open up the app, search for Spotify and it will automatically find and delete all files on your computer related to Spotify.
I use it all the time and it's a really great tool. If you ever decide to uninstall an app, the best way is to use this tool.
After that, download and reinstall Spotify.
I tried the methods you mentioned but they don't work. Still get asked to login each time I boot the Mac.
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