Ardour/Jack process stopping

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JPL
User offline. Last seen 1 year 5 weeks ago. Offline
Joined: 2009-10-12
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subgraph starting at ardour timed out (subgraph_wait_fd=17, status = 0, state = Running)
jackd watchdog: timeout - killing jackd
cannot read server event (Success)
cannot complete execution of the processing graph (Resource temporarily unavailable)
zombified - calling shutdown handler
09:46:50.279 Shutdown notification.
09:46:50.280 JACK is stopping...
09:46:50.280 JACK is being forced...
09:46:50.333 ALSA connection graph change.
09:46:50.417 ALSA connection change.
09:46:50.481 JACK was stopped with exit status=1.
09:46:50.481 Post-shutdown script...
09:46:50.481 killall jackd
jackd: no process killed
09:46:50.887 Post-shutdown script terminated with exit status=256.

Maybe a little premature but this has happened twice while jack was idle with Ardour and Hydrogen running but also idle. Hopefully this is a default behaviour that can be altered via a config fie, but maybe it's a problem that I need to deal with before I start really using these apps for all my recording projects. Any help would be appreciated.
Thanks