flipcollar put it nicely without sounding rude....but are the 5x5 360s really "no problem" and done with good form and speed, or are you deluding yourself?
imo it doesn't really matter why it happened (if you're not hurting somewhere and it's not an injury). Just take 2-3 sessions and build back up.
The first day back do something like 225-250 for some reps. Maintain good form and speed. Even if you could do more, don't force it.
The second day back work up to 315ish as long as your speed is there.
If you feel up for it on the third session, hit the heavy weights again.
If you're deadlifting between squat workouts use the same logic...the weights don't have to fly up like it's only one plate, but if you have to mentally prepare yourself before every set and it's a struggle, try cutting back for just a week.