I would look into the pyramid down option of 5/3/1 main lifts. Do them with as little rest as possible. It will help to add to your volume (which in my opinion is always good).
You can also do another set with the top weight for the day on your other lifts when you have a good day, and try to get the reps paused on your clavicles (it is very possible you are not using good form). It is also possible that you just had an off day (didn't eat well, or sleep well).
Believe it or not, it is also possibly a mental thing. I personally have a hard time with this sometimes. Think happy thoughts until it is time for your lift, then get excited and focused. Work to assist your weak points as well. Maybe your triceps are weak, or your traps or serratus anterior muscles suck (yes traps and serratus anterior are key in the press).
Check a few of those out and then I would recommend you explore the deload.