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There's your problem.
The seats are powered by the "consumer switched off" circuit. It's a circuit that supplies power to peripheral devices like seats and mirrors. When the car is off and doors closed, this circuit goes inactive after 10 minutes or so and stays that way until a door is opened. When you lock the car, the circuit goes inactive within 10-15 seconds.
In other words, the car is cutting power to your aftermarket keyless entry unit. I suggest getting constant power at a known good source, such as the current distributor.
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