"You have to make sure that the airflow is adequate through your condensing unit. Hence make sure the condenser outside the house is not being obstructed by any sorts of leaves, bushes or anything. There might be a good chance that your air filter has not been replaced for a while. Check if it needs replacing and replace it if necessary. Secure the insulation firmly to the suction line (large line) and replace any worn-out insulation. If the problem still stays, contact an HVAC technician to come look at the system."