Cuchulainn

In the Tain, Cuchulainn is depicted as basically the perfect warrior- he is brave, noble, dangerous and handsome and saves Ulster at the young age of seventeen. Achilles, Hector, and the Pandavas, the heroes of the Iliad and the Mahabharata were not without their own faults yet Cuchulainn seems to be faultless. Were there any flaws in Cuchulainn's character?