Well, today-- Friday, I had changed the sensors this morning before going to the Senior Center. The old sensor lasted all week with only a few hiccups here and there, but they weren't as bad as some issues. The old sensor went from extremely high to falling with either one or two arrows straight down on Tuesday morning when I was at the center. The receiver started playing music when I was walking in the hallway. When I took a look at the number, the arrow wasn't there at the time. It eventually came back, but there was no emergency to have anything. When I saw that the number was 269, I had a sneaky suspicion that there may have been a confusion for the sensor at the time and it fixed itself without me doing anything about it-- calibration, or otherwise.
So far, the new sensor is working perfectly with no complaints and/or worries. 
I will update you later this coming week if anything changes before next Friday morning.
Almost dinner time now here. Enjoy the weekend!
