PTP 600 08-50 Hardware Authentication

I have 2 PTP 600 links that have been in service for about 4 years, I recently upgraded there software to 08-50. In the last week I have a Hardware Authenitcation Alarm that has the status of Authentication Failure under the home page on each radio of the links. The links are still up and passing traffic. I can’t find anything about these alarms. Can anyone fill me in about this alarm and/or what to do with them?