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The expected battery life for sensors is 3-5 years, but that's within an ideal environment. In a colder area, for example, lithium batteries in general might have a slightly shorter run.

@jnthomas1941 , you did mention that the sensor was still working in Test Mode. If the battery was running very low, it might result in a decreased range (since it would have less power available). But it could also be interference. That is, something is getting in the way of the signal, but it doesn't happen all the time.

Interference can be caused by dense physical objects (brick walls, stone floors, metal appliances) that are literally in the way between the sensor and your Base Station; or it could be caused by another wireless signal competing for the same airspace. Or any combination of the above. Clearly the signal is able to make it through some of the time, but we want to make sure that the signal can make it through all of the time, so we'll need to think about what sources of interference we can mitigate.