what tem are you having? if more than system 1, does other indoor unit got problem operating too?
I faced such problem before with both my starmex and Panasonic..... indoor work a while got blower but not cold, then suddenly shut down, but other unit works ok.... both sets also electrical cable from indoor unit to outdoor unit got problem (rusty and broken somewhere)... change the cable, then no problem....
Usually aircon men will come and use a replacement wire to connect direct from your room indoor unit to the outdoor to test if the aircon working properly before they check the PCB and other component which are rarely giving problem.