I don't think it is the split that is wrong, but probably something else. Not enough high quality food, not enough sleep, workouts not intense enough, or workouts too intense. Keep a log and experiment.
But there's nothing wrong with trying a new split to shake things up. Here are some examples:
Nothing wrong with the routine. I think you are over trained. Get more high quality sleep, more/better food and don't push yourself so hard in the gym.