I added a link to show the issue with my delta printer. First jitter is not matter much I can adjust and fix that temporarily and even that it still does the next jitter when I try to calibrate it. (Which is main issue.)
Do you have homing endstops at the top of the frame? Sounds like one of the endstops isn't working.
I can imagine, the second rattling episode is caused by false homing.
I've changed the endstop it fix the first rattle but unfortunately second one still persists. I've also checked the mechanical parts and they work flawlessly so I think it is software related issue. I also post my configuration.h file it might help.