Owners/service Manual problems of the 2012 Hyundai Sonata Hybrid

While driving the car will randomly rev very high it started about 3 weeka ago while driving at around an average of 45mph in city. It was initially just revving 3-4 times until I hit the break and it was isolated to one incident per drive. But last night after driving on I-25 at highway speed I turned to a slower busy street more stop and go traffic and the car started revving again only this time it did not stop after one incident. As soon as I hit the accelerator it went into a revving fit. And didnt stop I couldn't even drive it because I could not get it to accelerate. I tried turning off blue drive and tried shifting down to 1st gear so I could at least make it at 10-15mph but it revved up even in manual gear. I had to park it for the night in a pretty sketchy neighborhood and call an uber. The system didn't populate any codes and no service lights came on. Then, this morning when I went back to get the car to a mechanic and it was accelerating fine though it was sluggish. I managed to make it 2. 5 miles to a mechanic without incident but still no service engine light.

When putting my car in park the warning "hybrid system warning! safely stop and do not drive" appears. If I turn the car off and immediately try to restart it will not start. If I turn the car off and wait about 15 minutes it will start with no alerts. This has happened approximately 10 times and I have taken it to the dealership but they are unable to duplicate it and told me there is nothing they can do. The manual says not to drive it after this happens and have it towed to the dealership. I am not sure whether or not to continue driving it since they cannot tell me what could potentialy happen.