Thermostat requires rebooting

Our AC works ok for a while then it just won't turn on no matter how hot it gets inside coach.  The easy fix is to turn off thermostat and turn back on to AC but when it shuts off due to cooling down to the set point then it won't turn back on.  Pulling the fuse for the thermostat for a minute seems to reboot it and then works ok but only temporarily.  Any ideas beside just replacing thermostat?  Thanks.

you need to give a little more information on the thermostat. Is it a wall thermostat or is it part of the roof ac ? And if it is a knob on the ac console it can be two different styles. Newer units now have thermistors which work electronically. The older one would use a mechanical style that has a sensing tube that is filled with a gas. At the end of the tube is a bellows assembly. when the gas gets warmer it expands and the bellows portion pushes against a set of points. which act like a light switch and turns your ac on and off. The problem with that type is over many years the gas can leak out very slowly. And at some point there is not enough force to close the points. And in that case the thermostat would need to be replaced.
Now the thermistor style is a whole new ball game. You would need a sensitive ohm meter to measure the resistance of the sensor. And then know the ohm value for the temperature that the sensor is at. After you find that out you can determine if its the sensor or the circuit board.