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The thermostat is bad nothing else would really cause that issue. You should verify power to the thermostat when it is blank though just in case it is losing power. Other than that replace the thermostat.
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If the unit is power off after it cycles either the internal thermostat board is defective shutting down or you could actually be losing power to the thermostat, check between the R and C terminals for 24 volts when it is blank, if you have power there and it is blank and you have to reset it replace the thermostat.