Server raid doesn't boot in the morning

We have a HP Proliant ML350 G6 with integrated sas raid controller. Since 3 days the server starts up in the morning without this raid. All othe HDDs / SDDs are ok.

We did install the ServicePack 2014.09, replaced the mainboard-battery and removed the raid battery (looked ugly, like it could be damaged, new one will be inserted when arrived).

There is an post error 1796, HP says "

1796-Drive Array – Array Accelerator Not Responding...
...Array Accelerator is temporarily disabled." at this page: http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c01702138

After reboot the server is fine. What could be the problem?

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