hosting_queued fails to restart itself

First let me state that this is unrelated to #2150787: Queue daemon fails to restart itself despite the nearly identical titles. I was also experiencing the issue described there related to the queue daemon failing to restart on PEAR-based installs, but I resolved this with the included patch.

I periodically and seemingly at random discover that the Hosting queue daemon is not running after waiting a few minutes for an Aegir task to kick off. I verify that the daemon is probably not running by checking /admin/hosting/queued and noting the "Last started:" entry is greater than the 30 minute restart interval I have set. I also then verify that it is not running by checking the status of the hosting-queued service from the command line of the server. I can start the service from the command line and it always starts successfully. It will run for hours, days, or even weeks at a time just fine and then without explanation or any error that I can find, it will fail to restart during one of the regularly scheduled daemon restarts.

I know I can write a quick cron job or something to start the daemon if it isn't already running, but isn't that the point of what the daemon already does? I am mostly looking for anyone else having experienced a similar issue and how they solved it or if anyone has any ideas on where on the system to check for a log message or something similar to help me determine why it is failing to restart. I am running RHEL. The instantaneous task execution advantage of using hosting-queued over the cron-based task runner is quickly lost when my coworkers and I are unable to get tasks to execute, so this is obviously something we are very interested in fixing. I am tempted to just go back to the cron runner, but I feel like there is something deeper going on here that isn't working the way it should.