Database in suspect mode...why does it happen?

I am using SQL 2012 SE with A-P clustering. We had an automatic failover around 3:00AM and the replication publisher database went into suspect mode. I gave it some time to see if it would come back to normal mode all by itself and when it did not I took
the db to emergency mode and then single user mode and did dbcc check and then when there were no errors I tried to bring it to multi user mode and it would still remain in emergency mode.
I tried to do take it offline and bring it online.But it wont go offline as it says database is in replication and cannot be taken offline. So I had to broke replication and take the database offline and brought it back online and then restarted the replication
from scratch.
I came to know that the LUN went offline and then came back online and that triggered the failover.
But, why did the publisher database go to suspect mode? I told my IT manager that the underlying disk that went offline was hosting the publisher database and since the disk went down and came back it took the database to suspect mode but he would believe it.
Is there a way that we can tell for sure that a specific issue caused the database go to suspect mode? Like any log/eventvwr? I had transaction log backups running like once every 10 mins for publisher database...could that be a reason?
Also are there any specific causes that will take a database into suspect mode?
Thanks a ton

From my experience most of the problems because of physical disk failure ... look also into Event Viewer.
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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i was going through this article about recovering a database in suspect mode :
http://www.mytechmantra.com/LearnSQLServer/Repair_Suspect_Database_P2.html
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