The first step is to determine where it is leaking from. If it is leaking around the outside frame and or sill, it could be a caulk problem(installation issue). If it is coming in around the sliding door it could be a factory seal problem(manufacturing and or installation issue). If it is over flowing the track it could be a blocked drain. Sometimes dirt builds up or caulk is inadvertently put over drains. Either way I would have the contractor come back. You can try and replicate the problem while they are there by spraying it with a hose. Good luck.
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