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Are you saying unit is shutting off before setpoint on thermostat is reached and if so, both indoor and outdoor or just one or the other?
OK there are several things that could be going on.
1.Shutting off on high or low pressure
2.Float switch in drain cutting off the 24v to unit
3.Thermostat problem dropping out thinking temp has been reached
4.If unit has a utility company box mounted beside unit, power company may be disabling unit
Lets tart with that utility company box. Some customers agree to have a box installed that allows the power company to disable unit certain times of day to reduce load on power station and in return get a break on power bill.Do you have such a box?
We may have to troubleshoot when it is off and should be on.Do you have a meter for checking voltage and are you home and available during the periods it is acting up?
Yes, I am here most every day. When it is off and should be on, lets start by checking to see if we are losing the 24 volts from inside at the condensing unit.WE will go from there.
Look forward to helping you figure this out.