My opener is an older model, 45DCBLD, and I discovered that my neighbor's opener operates my door. So, I reset my opener by holding down the learn button, and that seemed to have solved the problem. But, the issue has since returned 2-3 times, and I go through the reset operation again. My opener has never opened my neighbor's door. Is there anything I can do to program my door so that my remote's signal code remains unique?