Job time on collection has slowed drastically

Good evening!

I am running a job on the main server using fastq files in a data collection from single end 3’ tag sequences and, after some modest preprocessing, ran RNA STAR to map to a custom genome (Mmul_10 from Ensembl, including GTF file). The collection consists of 30 files. The first 17 ran fine, but now the current five samples have been running since Tue Nov 26 01:06:35 2019 (UTC) (it is currently 07:23 on Thursday 28).

Does this sometimes happen? All of the samples were of similar quality and number of reads, and all were aligned to the same genome.

Thank you in advance!