1999 Honda Civic Ignition Lock Key Kickback

For the past few months, I've had a problem starting the car in which I'll turn the key to start the ignition, but as soon as I let go of the key, it flips back and shuts the car off. This is especially inconvenient when I am going 85mph on the freeway and suddenly the key kicks back and turns off the engine, and all I can do is brake and steer to safety. I'm not sure whether it's something within the ignition lock cylinder itself, or just a spring or something that got loose. Does the whole thing need to be replaced or only a part? (Ignition Lock Assembly?)

Another thing I noticed about it is that it only gives me a hard time when the car is hot (i.E. Left outside). But if the car is cool (at night or in the shade) I don't usually have a problem starting up. I took it in to Pep Boys to get it looked at, but they couldn't see anything without actually taking apart the steering wheel (so I don't think it has anything to do with spark plugs, ignition coil, or the starter).

Thank you to anyone who can help me solve this problem!