I'm running Cisco Unity 5.0 and I just started having issues with the "Message Waiting Indicator" becoming unchecked for no apparent reason. I had users complain their MWI light was on with no messages or off with messages. I went into the subscriber and found the "Use MWI for message notification" box unchecked. I went back in and set it up and all was well again. Any idea why that would get reset?