I am having the same issue. Have you figured out what your issue was? I have been running my asr-72405 for years with no problems, I attempted to upgrade the firmware to the latest I could find but it did not help. I found that it started when I upgraded my OS to 6.12.6 so I reverted to 6.12.4 and the problem went away. I couldn't find anything in the changelog that would explain this, but if you figure out the root cause please post.