In this case, the frame rate is too close to the edge of limitations of the camera's performance. If the red exclamation mark is coming and going and you happen to press record when it's green you can start the recording and have subtle problems like frames acquired at inconsistent rates in the recording. Reduce the slider for frame rate/Fmax by a few frames per second. You can also close all other open software to free up computer processing power.

The location of the Framerate status icon and tool tip:

The Framerate status icon showing a framerate which the camera cannot resolve: