Emerson Exchange 365

Hello,

I´m experiencing a strange issue with one of my redundant controllers. The time stamp of the events of this controller are not synchronizing with my proplus, to fix this I have to perform a software switch over between them twice, by doing this I force them to ask the master NTP for the time and they get the correct one. This solution worked the first time for almost one year but the last time that I performed that procedure it only worked for less than a month. Did someone had the same issue? or can someone give me some hints on what could be happening.

Thanks