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clicking noise and now the red light

I have a smart stat TH115-AF-GA-08 (or whatever the older model was) with the PB112-120GA that we installed about 5+ years ago. Its worked well until recently. Now there are times where we hear a clicking noise from the panel like the thermostat is having a problem. I'll turn it off and on and it seems fine for a week or so then does it again. Now the red standby light is coming on and the clicking is more frequently. So obviously something is wrong but any suggestions or is it time to replace the unit?
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