Do you have persistent members set on the queue?
If you have, it might be related to this bug https://issues.asterisk.org/jira/browse/ASTERISK-22546 which wasn’t fixed last I checked.
After pausing the member, just do some other action to the queue, like add and remove a random member, and see if that helps. I have no issues with members loosing pause state on restart of asterisk, on the servers I run.