How many sets do you go to failure on if any? Going to failure on a lot of sets or doing too much negatives would cause overtraining that would make it hard for your nervous system to recover.
You mention deads as one of your exercises. Do you mean deadlifts? I would not deadlift and squat in the same week unless I was doing a very low amount of exercises and not going to failure.
Make sure your post workout recovery drink has a good dose of protein, but also a very large amount of carbs.