This has been going on far too long. The persistant cache building and reindexing/rebuilding is rendering my desktop app almost useless. I have to go and find the folder, wipe it and restart Spotify manually.
This quick fix worked for a while, but it's less effective now.
Loading up Spotify on El Capitain can take up to 10-20 minutes per day as it tries to load friend activity and the central panel. I can play music, but can't see albums or search. As I type the friend activity has now loaded after 10 mins but the browser still doesn't work - blank.
You need an overhaul of this desktop app, because it clearly doesn't work anymore.