sporadic tire pressure light

[hedron]

I've been getting sporadic TMPS sensor light all summer long. The first time it happened I immediatedly filled the tires, but they were already set. I set the pressure at 35psi for all tires.

My going theory is that the heat messes with the sensor, but IDK how the sensor actually works so that's why I'm asking.

Also, thought this might just be a quirk with the car itself? But I doubt it.

Do I really need to unseat the tire to check the sensors? That's what i'm reading in other threads.

Some video said it could be one of the sensors needs its battery changed. I have no idea when or if the battery was ever replaced.