Shuffling music in a playlist only shuffles some music

[SixWW]

Im having a really terrible time with the shuffle feature in Spotify. My issue is that in my playlist of +2000 songs, whenever I shuffle, it only shuffles the first 50 or so songs and continues to repeat all of them indefinatly. It also plays the same artist and album back to back very regularly. I will be ending my subsciption soon if I cant find a fix for this because it is a pain to pick through all of my songs to play them randomly.