Wireless door sensor has mind of its own

hardware: Ademco vista20p, honeywell 5800rps wireless door sensor, wireless honeywell keypad 6160rf My keypad registers the door sensor as open only(zone faulted). I tried changing the batt and it worked for a bit but then right back to faulted. Front door works fine. Have tried putting it right next to keypad also. It's only one year old. It doesn't give a batt lo or no supervision condition. Any thoughts?