Maybe it’s just calling for a bit more care or maybe it was just sheer misfortune, but my uploads on a particular assignment failed (I didn’t notice it when it failed the second time) and it cost me a couple of letter grades in Optimization. GPA wise, a dip of 0.6 in one shot. Wow.
Note to self: Perhaps I should start believing my students more often when they say the upload onto the university LMS failed, leading to no-submissions. Haha.