Nutone IM-3303 Master Station has turned on on its own the past few mornings without the timer being set.

For the past few mornings, our Nutone IM-3303 Master Station has turned on the AM/FM radio on its own. The timer was not set when this occurred. Have checked the control voltages from each remote station and all are within the recommended range from the installation guide. All controls work properly. Can anyone help solve this mystery?

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