Looking at the last 3 water temp readings posted, there should be little doubt that the Lakeport probe is defective. The water temp simply doesn't swing 5 degrees in one day, not to mention that the readings of 28 and 30 are not possible.
Based on my experience with my probe on Merrymeeting, work on a UNH lake monitoring team, and the posts from others, it looks like things started to go awry in the late August/early September time frame.
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