I've found that by the time I get done arranging and mixing a song and have it posted in the net, I'm already tired of it. Not 100% of the time, but that happens for most of my music. It may be due to me always finding something wrong with the mix after it's all up on social media shit, which is very annoying. A lot of times though my tracks are missing something, but you can't just sit around all day trying to figure out what it is when the world won't miss the song that you never posted anyway. Just take it for what it is and use it as motivation on your next song. If you're like me, once you have thought to have "finished" something. You never want to touch it again, as if the energy that was once in it has died. That's what it feels like for me at least. Getting off topic a bit, just speaking my mind is all. Good luck.