Nissan Intelligent Key issue 3

https://wiki-velo.win/index.php/What_the_Key_Symbol_Means:_Your_Nissan_Anti-Theft_System_Explained

I'm having trouble with my Nissan Intelligent Key not unlocking the doors consistently; sometimes it works fine, other times I have to press the button multiple times or get really close for it to register. I've replaced the battery but the issue persists, and it's getting frustrating not knowing if it's a key fob problem or something with the car's receiver.