2018 prius - right side rear door won't open

Hi guys, hopefully you can help me.

Sometimes when I go back to get the car in the parking lot and unlock it with Smart Key Entry, it won't open the right side rear door. It doesn't happen all the time, just occasionally, but it does bother a little bit since the car is just 8 months old (it's a 2018 prius touring).

When it happens, I always pull out my remote control to manually press the unlock button and by doing so, it always works and immediately unlocks. Very weird... Do you know what that could be?

Thanks, Albert.

 

@CooCooCaChoo You're right, there's a setting about it. At first, I really thought it could be the reason. But then, on second thought, I guess it is something else, because the problem occurs just occasionally, not every single time I unlock the car with Smart Entry System.

@bisco Yep. Under warranty, I bought it as a new car back in January 2018 (it took almost 3 months to get it from Japan).
In Italy we have 3 yrs warranty for the vehicle, 5 yrs for hybrid components and 10 yrs for the HV battery.
I'll definitely stop by the dealer when I get the chance.