Car is a 2004 STI.
The key fob was acting up (lock and unlock buttons didn't work most of the time unless I mashed the buttons... but the red light still lit up), so I replaced the battery. Seemed to do the trick.
5 months later it's doing it again. First thing I did was replace the battery, but this time it did nothing to solve the issue. So I dissected the fob to check the circuit connections, which appears to be all intact.
Any ideas? I can still open the doors with it after hitting the button about a hundred times (I wish I was exaggerating). I'll use the key in the meantime, but any advice would be great. Thanks!