Intel SSD toolbox 3.3.3 is available and contains new firmware for the Intel 750. I just updated my 750 to the new firmware and it seems ok.
Link to download page:https://downloadcenter.intel.com/download/18455/Intel-Solid-State-Drive-Toolbox
Link to download page:https://downloadcenter.intel.com/download/18455/Intel-Solid-State-Drive-Toolbox