Exchange 2013 DAG Failover Reason

Hi,

I have a 2node Exchange DAG on 2013 SP1, all is fine however quite often 2 of my mailbox DBs flip over to server 2, always the same pattern.  What's the best way to determine the reason why?

DB1 & DB2 sit on Exchange 1 for a while and then eventually move over, I checked logs but impossible to track!
pjmartinsAsked:
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pjmartinsConnect With a Mentor Author Commented:
Guys, found the answer.... Was due to NICs going to sleep!  Take note as easily missed...
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R--RCommented:
Check exchange logs on server in event viewer.
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AmitIT ArchitectCommented:
This might help you to find root cause
http://exchangeserverpro.com/database-failover-wrong-server/
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