Celery 3.1.25 sometimes falls over on Windows

Celery 3.1.25 sometimes falls over on my Windows system. I am running this with billiard 3.3.023.

Here’s what appears in my Celery log file:

[2019-07-26 09:06:48,473: ERROR/MainProcess] Task remapp.netdicom.qrscu.qrscu[a389bc34-3014-4022-81cb-ae08e7cb5685] raised unexpected: Terminated(-15,)
Traceback (most recent call last):
  File "d:\server_apps\python27\lib\site-packages\billiard\pool.py", line 1678, in _set_terminated
    raise Terminated(-(signum or 0))
Terminated: -15

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Once this has happened Celery fails and no more tasks are processed (they build up in the queue).

I will switch on debug and wait for it to happen again to shed a bit more light.

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