why does my zebco 11 micro spincast reel stop the line from going out?

this is my sons reel, and it seems 2 outa 3 times it fails to cast, or when it does cast, the line goes about 20-30 feet and stops, dropping the lure well short of the desired target area. I know, I know, go get a spinner reel, and I have one, but like I said, this is for my 7 year old boy, any suggestions on why it does this? and how I can fix it?

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