Model failures -- error closing unit 103

I had ten simulations fail at 04:07 (ish) today with errors of the form:


sys-11 : UNRECOVERABLE error on system request 
  Resource temporarily unavailable

Encountered during a sequential formatted WRITE to unit 103
Fortran unit 103 is connected to a sequential formatted text file:
  "pe_output/dn00m.fort6.pe.stdout"
 Current format: (A)
                   ^

sys-122 : FATAL error closing unit 103 during program termination 

Had archer2 disk space filled up again?…Though data is going to the a2fs-nvme space so that seems unlikely.

I removed (cylc clean) some old simulations and resubmitted one, waited a while and then resubmitted the rest. All (right now) are running.

Simon