Transmission fails after car gets to operating temperature

The car listed above has an automatic/sport mode transmission. The car starts and drives fine before it warms up. All gears are smooth. Nothing seems out of the ordinary. As soon as the car reaches operating temperature the transmission stops working all together. No first, second, third or reverse. Nothing. If you shut the car off and wait forty five minutes and start it again it goes until it warms back up. Things I have done to remedy this problem include: Changing the transmission fluid, filling to specs, changing the thermostat and the sensor on the housing ( only because the problem seems temperature related). I have researched a lot about this and found nothing. The condition of the car previous to warming up tells me in my gut that the transmission is not bad but something controlling it is faulty. No codes are being thrown ECM or TCM wise. From what I understand there is no filter. I am mechanically inclined and can check electronics if I know what needs checked. Please any help or advice would be appreciated.