Hi,
see the below product release notes: http://www.mellanox.com/pdf/firmware/ConnectX3-FW-2_30_8000-release_notes.pdf
I couldn't see the GIGALIGHT SFP module in the supported list of module (table 2, pg. 7). It could be the source of your issues.
Other then that, I don't believe I've seen what you are describing. See if you can get another SFP module that is listed in the release notes.
Cheers!