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P1529 is for a comminication fault between the engine control unit and the transmission control unit.
P0722 is a fault on the output speed sensor circuit. However, this doesn't always mean the sensor is faulty. It could also be a wiring fault or a faulty transmission control unit.
Because this fault is intermittent, I would be more inclined to think it was a wiring connector fault. Check all the wiring plugs have a good connection. Open the plugs and check for signs of water or corrosion. Also check any earth points. Your thinking it could be temperature related is also a possibility but not with engine temperature but transmission temperature. It won't start getting warm until you are moving.