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My softub is acting funny. The lcd screen will read 100 when I reset the guitar, but won't always allow me to change the temp. Usually after a few minutes, the lcd screen either shows 1 single number, such as 0, or 3 or it will rapidly flash a random single digit such as 0, 3, or 00. The pump turns on, the heater works and the jets work. But when the lcd screen goes awry, I can not get the jets to turn on or change the temperature. Does this sound like a circuit board issue?