For dl380gen8 helped movng sas card to another pcie slot... For 360 on esxi 5.5 nothing helped even replacing mb and sas card, we downgraded to 5.1 and updated bios, card bios, and reinstalled esxi from hp 2014 february version.

The only stable config for me is HP customized esxi 5.1 from february 2014. and newest firmwares from hp site. and according to msa2040 compatibility chart support for esxi 5.5 is still pending...