Boxter Remote Key Problems
 

Can anyone help?
Boxter Remote Key problem: I note that my remote key is struggling to work and only after many attempts. This happened to my other key and hence I started to use this remote key which was fine for a while but now same issue. With a fresh battery it was ok for a few weeks also.

Have tried the following:
Fresh battery , checked that not in sleep mode, and have resynced the codes by using the remote within 6 seconds of key in and key out of ignition, reversed polarity of battery also.

HOWEVER : i have found that both keys work perfectly if I open the remote casing and use the remote out of the casing.
Any suggestions
Thank you