PDC role transferred on it's own

We recently migrated our DC from SBS 2008 to Sever 2012 R2 Standard. We transferred the FSMO roles successfully and decided to keep the other server around as a secondary onsite DC. Today I logged on to run some verifications. When I ran NetDOM /query FSMO, it came back with the PDC and Domain Naming Master roles back on the old DC.  No one here migrated those roles back to the old DC. I'm wondering if anyone here has experienced this and if so, do you know how and why this occurred. Searching through Google brought back little to nothing.
MukooSystem AdministratorAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
In this scenario the SBS needs to act as the PDC because you still have this in your environment. I am not sure if this process would switch the PDC role back to the SBS server, but for End User License Agreement (EULA) PDC needs to be on the SBS server.

If you have AD Auditing enabled you will be able to see who changed this role back to the SBS server.

Seth SimmonsSr. Systems AdministratorCommented:
keep in mind also there is a 30 day grace period so once the FSMO roles are off the SBS server, after the grace period is over, the server will start rebooting periodically.  better off building another 2012 server if you want another domain controller; either that or keep the FSMO roles on SBS.  as will stated, it is a license requirement as long as the server is in production
With SBS 2003 to any regualr edition, you could extend the grace period from 7 - 21 days after the FSMO rolls are migrated...

MukooSystem AdministratorAuthor Commented:
SBS2003 and SBS2008 are a bit different. The solution to extend the 30 days does not appear to work for SBS2008. We looked into this prior to the migration. As per the periodic reboot (every hour). I believe that that also is for SBS2003. We've ran this server for more than 60 days passed the date that the FSMO roles were transferred without issue or without having run into any reboots. There isn't much written in the way of a migration from SBS2008 to Server 2012 R2 Standard. We researched this for at-least 2 months prior to executing.
We're going to decommission the sbs2008 server and we ran the network without it to ensure everything was good to go. We just wanted to explore what would occur if we ran the server... We now know that the PDC role and the Domain Naming Master have migrated back to the SBS server, BUT we can't seem to find anything in the event logs as to when this occured or how. We're just being presumptuous that this is due to having run it past the 60 days but we really don't know this for sure.... Hence why I posted on here. If anyone can provide some clarity, that would be great.

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MukooSystem AdministratorAuthor Commented:
Couldn't find what I was looking for.
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