Everything gone wrong

[VideoJones]

I don't know what's happened but I've gone from having zero problems with Spotify, to having all of them. The app now won't play music when it's minimised without a workaround, the bar at the bottom can't be used to pause or play and it never changes song or how far through the song it is, the queue is always blank no matter what I do and I can no longer save songs as the + icon isn't there and neither is the option to save after pressing the three dots. It seems to have happened after the latest update, bearing in mind that I've also cancelled my premium (but that doesn't run out until the 13th). I would like to know if I have any options other than reinstalling the app as I have terrible internet and it takes ages to redownload the songs.