It's not covered very well in the text manual, but it sounds like it might be the post-off voltage display. The sequence from full to low is purple --> blue --> cyan --> green --> yellow --> red. If that's not it, then you might try factory resetting (13H).
I did some more testing, and it seems you're right. Although, after factory resetting it still does the same thing. Looks like it's the default, and I don't see where to go to it in the UI.
It's a bit convoluted. You can find it in my diagram in the Voltage Config box. You have to do it from the Advanced UI.
As already mentioned, this is the post-off voltage display. Depending on your firmware version, its time can be changed from the battcheck menu. Set to 0 to turn it off.
The red flash is a bug that already got fixed (together with several other bugs). Do you have a flashing kit for updating the firmware?
Portable illumination
Rules:
Related: