When is the last time you had the battery changed? Just speaking in general electrical terms, the alarm probably draws more amperage than any other function of the watch, so if the sound is diminishing over time that could be an indication of a weak battery. I understand you don't know if it has diminished in volume over time but it certainly is quieter now, so that assumption isn't too big of a leap. Troubleshooting an electrical issue usually takes an approach of addressing the most common point of failure/easily replaced component first, and continuing that process with the next most likely/easiest component until the culprit is found. In this case, changing the battery would be the easiest thing to do, and see if that fixes the issue.
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