I am in the same boat - rank 20, grade 18 and for some weird and wonderful reason the auto is deciding that it doesn't want to run all night anymore.
I set it when I went to bed last night and I was 37.7% of the way to grade 19 and when I woke up the auto had stopped, my computer was in hibernation, and I was stuck at 72. something of the way to grade 19.
Very frustrating all of a sudden. !@#$