Problem with Scangauge turning off at high speeds

Yes, Fuel Type is set to Hybrid and Yes, Sleep Event is set to COM.

It never used to do it with v3 firmware. I sent it in to have it upgraded to v4.06 and ever since have had this problem.... Definitely correlated with the upgrade.
Has anyone else had this problem? It is only on the highway, although I often see the backlight flicker at other times. Last night it happened 5-6 times in 2 minutes. It comes back to life if I press the red button.