On Nov 14, 2017, at 16:43 , Nathan Day <nathan_...@mac.com> wrote:
> 
> I have a background process that uses an NSTimer that is set to fire every 
> minute, but when the computer is inactive for a while it will stop firing

My guess is that it’s not a problem with the timer, but with the quality of 
service (QoS) of the thread that’s servicing the timer. If this is a background 
process, it may be that the default QoS is “background”, which allows the 
system to defer execution indefinitely. I would suggest you try setting the QoS 
to at least “utility”, perhaps even “user initiated”.

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