I have an 06 Jetta TDI with under 40k that has had a problem with the keyless entry for maybe 15-20k miles now.

The lock button on the clicker will work only when the car/weather is warm. The unlock button hasn't worked in a while, regardless, though randomly it will work. The trunk and panic work also when warm.

I'm thinking this isn't the clicker's problem but the sensor or receiver in the car. Is that something that can be replaced (fuse/relay)? Where is it even located? Thanks.