Answered calls return to queue and are unanswerable

I would estimate around 3% of our calls suffer from this issue.

Calls come in to our queue and hear hold music.  When an agent answers, they are usually able to get out a few words "Thanks for cal–" and then the call returns to playing hold music.

After placing calls all day long, I finally was able to duplicate the issue.

A 'core show channels verbose' showed my number in the queue:

Channel Context Extension Prio State Application Data CallerID Duration Accountcode PeerAccount BridgeID

PJSIP/comcast-0001bf ext-queues 2100 64 Up Queue 2100,t,,,240,,,,0, 36020----- 00:02:13 52d1d5b3-870d-47ad-9

It shows I am in the 'queue' app.

iSymphony doesn't show me in the queue.

'queue show 2100' shows the agents, but doesn't show my call in the queue.