Why is my carkey loosing range

Hi,

i noticed that the remote in my key loses range. So i changed the battery, but that didn´t help. I´m still loosing range. Any ideas how to fix it?

The key looks like the one in this thread, the original electronic is shown on the right hand side.

http://www.audifieber.de/audiforum/threa...

crwdns2893858:0crwdne2893858:0 crwdns2893862:0crwdne2893862:0

crwdns2894050:0crwdne2894050:0

crwdns2889612:0crwdne2889612:0 0
crwdns2892346:0crwdne2892346:0