DeviceFarm Job Errored with all suites in Pending status

We submit test suites to be run on iOS devices on DeviceFarm. Out of ~60 runs daily, 1-2 fail with no details or logs. The run's status is "Errored", and all suites in the run have status "Pending".

What do you recommend we do for debugging this further? There are no files generated for these runs, and Logs never load.