Queue Hang on FreePBX Reload

Sometimes when doing a FreePBX "Apply configuration changes" on the server when it is busy, the queues seem to "hang". By this I mean that the status of all devices in the queue remains static until Asterisk is restarted. Strangely there are only ever "In use", "paused" or "On Hold" statuses - never "Not in use". Once Asterisk is restarted everything returns to normal.

While the queues are "hung" we see a lot of the following errors in the logs:

[Nov 4 09:12:59] WARNING[45096] channel.c: Exceptionally long voice queue length queuing to Local/4066@ctidialed-4ca8;2

I believe the above message is a symptom rather than the cause as we occasionally get this message throughout the day normally.

I have done a lot of research on FreePBX/Asterisk forums over the last week to find a solution, but have not found anything that resolved this. I have temporarily renamed retrieve_conf so that FreePBX can't reload and hang the queues on this production server.