The same for me:

● cups.service - CUPS Scheduler
   Loaded: loaded (/lib/systemd/system/cups.service; enabled; vendor preset: ena
   Active: inactive (dead) since Di 2016-08-30 08:42:33 CEST; 34min ago
     Docs: man:cupsd(8)
  Process: 11682 ExecStart=/usr/sbin/cupsd -l (code=exited, status=0/SUCCESS)
 Main PID: 11682 (code=exited, status=0/SUCCESS)

error_log attached. Nothing special in there. cups is just going
inactive and doesn't come back. A 'sudo service cups restart' fixes the
problem until the next reboot:

● cups.service - CUPS Scheduler
   Loaded: loaded (/lib/systemd/system/cups.service; enabled; vendor preset: ena
   Active: active (running) since Di 2016-08-30 09:19:19 CEST; 2min 26s ago
     Docs: man:cupsd(8)
 Main PID: 17018 (cupsd)
   CGroup: /system.slice/cups.service
           ├─17018 /usr/sbin/cupsd -l
           └─17025 /usr/lib/cups/notifier/dbus dbus:// 


** Attachment added: "error_log"
   
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1598300/+attachment/4730601/+files/error_log

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https://bugs.launchpad.net/bugs/1598300

Title:
  cups hang after a while

Status in cups package in Ubuntu:
  Incomplete

Bug description:
  after 6 minutes or so, cups is not responding.
  it do not produce error on the log, just stop working, worse, it exit with 0

  
⌌—————————————————————————————————————————————————————————————————————————————————————⌍
  |root@cupsmachine :~# systemctl status cups                                   
        |
  |● cups.service - CUPS Scheduler                                              
        |
  |   Loaded: loaded (/lib/systemd/system/cups.service; enabled; vendor preset: 
enabled)|
  |   Active: inactive (dead) since ven. 2016-07-01 10:31:32 TAHT; 2min 16s ago 
        |
  |     Docs: man:cupsd(8)                                                      
        |
  |  Process: 28686 ExecStart=/usr/sbin/cupsd -l (code=exited, 
status=0/SUCCESS)        |
  | Main PID: 28686 (code=exited, status=0/SUCCESS)                             
        |
  |                                                                             
        |
  |juil. 01 10:30:01 appli-client systemd[1]: Started CUPS Scheduler.           
        |
  
⌎—————————————————————————————————————————————————————————————————————————————————————⌏

  I got to launch it again, so I have finish with a cron job like
  */10 * * * * systemctl status cups.service|grep -q 'inactive (dead)' && 
systemctl start cups

  but it is a dirty solution. I have no idea of what make it stop.
  NB: I have seen problems related to apparmor, this machine has no apparmor 
package.

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