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Warning Icon on Energy Graph

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I understand that when my MS 100D is still cold and the temperature outside is frigid (-5F) the Energy Graph will show dotted orange lines and regenerative braking is limited. However, I'm not sure what the orange triangle with a warning "!" at the bottom of the dotted line means. I've seen this pop up occasionally after the care has been driven for awhile. I couldn't find in the Owners Manual either.

Any ideas?
 
Happened to us yesterday when driving in 33-40 degree weather - regen was restricted for quite a while, and the yellow warning sign showed for brief periods - without any explanation.