Why does my thermostat buzz?

Hi -

I have a Warmly Yours installation in my bathroom and it suddelly starts buzzing loudly at the thermostat (Aube TH115 A/F/AF). I don't know what kicks it off (seems to happen at night while I'm asleep - loud enough to wake me). Sounds bad - like something is wrong. Been doing this for years, but I'd like to know if it's dangerous and/or fixable. Fire hazard?

Thanks,

Patricia
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