Our company installed a Bryant evolution communicating heat pump system in January. No problems during heating season. Client was very pleased with lower utilities than prior system. I went out for a quality control check when it got warm to adjust puron levels as needed and verify operations. I got the subcooling to the desired 12 degrees it calls for. A week later went back for a no a/c call. Unit went off on high head. I recovered 2 lbs of puron and unit was once again working at correct range (12 degree subcooling and 15 degree superheat). We then got another no a/c call and I found indoor coil frozen over. I let it thaw and ran again and levels checked out fine. I replaced txv due to the issues I was having with refrigertion end. Everything worked fine for a week until today. When I arrived the outdoor unit was running. Head pressure around 80 degrees saturation but the suction was negative 10 degrees. I checked indoor coil and it was frozen over only the bottom half. I ran the unit in heat pump mode to thaw the frozen part of coil. Put back on in a/c and it worked fine. The entire time during all of these issues my airflow was running at 1050 cfms and at .1 total static pressure. What is going on? Can coil be internally plugged at certain areas or what?