NX5 HD-SDI and HDMI both active?

[Rickard Cleanmountain]

When recording to a memory card and at the same time sending out a SDI signal the SDI signal have an overlay. Not a clean signal. This goes away if I remove the memory card. But since I need to record and send a signal on via the SDI This is an issue for me.
This is all during recording. Not playback. In playback there is no overlay.