Pete Prayor

I have a 02 CL500. This car does not see any rain or snow. Having said this, the car has been sitting since late November with an Optima Charger/Maintainer connected. I periodically will go out and start the car to keep everything lubed etc.. The other day I went out and started the car and let it run for about 10 minutes as usual. However, this time the doors locked with the key inside. Had to get AAA to come out and get in the car as my 2nd proximity card's battery was dead. This has never happened before and I'm wondering if anyone else has experienced this and if there is a fix?