Now I know what Angry Bees sound like! Today while in HV Sport with about 60% of EV range available doing around 55-60 on relatively flat road the ICE went nuts. Revved to what sounded like red line while white power circle stayed in the lower half. It did this for about 2 minutes off and on. I switched back to full EV mode and the ICE shut off as usual. Shortly entered the highway and returned to HV Sport. Drove for an hour at 75-80 mph with no recurrence of the super high revving. Also no issues on the trip home which involved more high speed highway driving in HV Sport. Until now I had no idea what the angry bees people talk about sounded like. Now I know. It will get your attention quick as it sounds like the ICE is about to freewheel itself into pieces. First time in 4,000 miles this has occurred. Think it's a dealer visit? Or just a ghost in the system? Only 2 other issues with the car have been the standard HV range issue and a bad Infotainment Head unit which caused noisy Bluetooth calls. Both have been fixed by dealer. No error messages knock on wood. Comments and advice on next steps are welcomed please!