i had this problem and it was annoying me for quite a while. i went through a fair few new power steering belts. i found out eventually it was actually the belt i was using... the belt was the right length but for some reason it had ribs in it and was just a tiny bit too wide for the pulleys causing the belt to twist after a while and fly off. even though this was the belt they listed for it.
so lesson learnt don't buy belts from supercheap auto.. lol
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