My 450 is having issues with warm/hot starts. Started all winter without any issues but summer weather is returning to the prairies and now it won't start unless it has been sitting for an hour or so, even after a short drive. It starts fine cold and there are no drivability issues. When the engine won't start the starter acts oddly. When I rotate the key position to start, the engine cranks normally. If it doesn't start after a few rotations I let go of the key and allow it to return to the run position. When the key returns to the run position the starter continues to crank the engine over at the same speed. If I turn the the key to the Acc position the starter will stop. Once the car sits for about an hour it will start within two rotations of the engine and run completely normally. Any ideas where to start looking? Thanks.