I have a 1995.5 S6 Avant. The doors worked great and then one day ...I locked the car and it would not unlock with the remote. I changed the battery and I did the remote reset and the locks worked with the remote. I drove the car locked the car at the store came out would not unlock so I used my key got in. Checked the battery voltage at home it was good 3.1 volts. I reset the remote again unlocked and locked the doors several time with the remote and it worked about 5 times and then it quit working. Reset the remote and once again worked for a couple of time and then quit. Any ideas? 