I've got an 1880 kv hobbywing combo with the xerun 80a ESC and 20C 5000 Mah Lipos at 14.8 V. After the third run it started emitting a terrible screeching sound. Plus It doesn't want to reverse. Can anyone tell me what has happened? I've ordered twin 11.1v lipos and a Castle Creations Monster 2200kv combo system. I want to sell the Hobbywing system but I need to know if its burned out first. Any Ideas?