This might be my issue. after . I have a 2016 prius c. After it runs 45-50 minutes . when i release the gas pedal it revs a few seconds. . once this starts the car says EV is not available at the moment. If I shut the car down for 4 hours it goes back to normal . started a few weeks ago. I will check the fan. went to the dealership and they didnt see anything . I also called Toyota about it and they logged a case but had no info .