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Door lock actuators are a notorious issue on these earlier Lexus/Toyota's. More likely, you are hitting lock and walking away from the car not actually being locked on one or more doors. I just had to replace both the rear actuators on my RX300. I suggest you sit inside and try several lock and unlock attempts and see if any of your doors fail to lock or unlock at any point. That is just the most plausible case here is all I'm saying.