I have a 2012 Prius Plug-In (Advanced) with 38K miles. This morning (outside temp: 75C) we were driving on the interstate at 60mph with Cruise Control enabled. It was not in EV mode (we had forgotten to charge it last night). About 5 miles into the drive the cruise control turned off and it displayed a Check PCS system and a Check Hybrid System. error message. Other than the constant error messages and the cruise control being automatically disabled, the car was running fine. I exited the highway and ended up at a stop light for a couple of minutes. This is where the car typically shuts off the engine and goes into battery mode. Well, when I got Green signal ... I tried to move and the car was extremely sluggish. I put on the hazard lights and pulled into a parking lot and turned off the engine. Turned it back on after a couple of minutes ... kept in on and in Park ... about five minutes later the gas engine kicked in and I was able to move fine. I quickly turned around and took the interstate to head back home. It drove fine on the interstate (gas engine was on all the time). Took the exit to head home and same problem - the gas engine shut down and the thing became sluggish (could not drive faster than 10-15 mph). About two minutes into that the gas engine slowly kicked in and I was able to get back to decent speed to get home. I also noticed that the dash display that typically shows the animated arrows between engine / battery etc ... it was not showing any arrows - like there was no communication between the engine and battery. Now here I am trying to figure out what happened - any clues.