Remote barely working

[ohhh my]

In the recent month, my remote to lock and unlock the door on my 03 boxster s barely seems to work. It works maybe 50% of the time. I literally have to stand right next to the door for it to work. And sometimes standing right next to the door it doesn't even work and I would have to manually unlock the door.

I've replaced the battery twice now and the light on the key flashes when I press any button. I live in california and it hasn't rained in weeks and i've reached under the driver seat to see if there is any moisture and there is not.

Any thoughts or ideas on what may be causing this?

I really do not want to have to shell out money to purchase a new remote...