I suspect you may be getting line loops around a guide when you cast. If the guides are large and the braid fine this is a set up for the line to tangle on a guide and cause trouble. Another issue (if you are very inexperienced) is bail flip. If you cast too violently the reel handle may turn and the bail may close stopping the cast. This should be evident if the bail is already shut when you go to start your retrieve.
Why don't you just ask a more experienced fisherman to cast your rod a few times and see if he can trouble shoot it for you?
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