[YouTube-API] php - simplexml_load_file returns sometimes HTTP request failed! HTTP/1.0 403 Forbidden

i'm using php5 simplexml_load_file($youTubeFeedUrl) to get the feed. 

I am getting a playlist of a user and therefore do not need authentication.

it works maybe 80% of the time.

when it's not working i get:

failed to open stream: HTTP request failed! HTTP/1.0 403 Forbidden

 Obviously I'm doing something wrong.

i'm using a shared Host at hostgator.

My IP: 50.22.42.151 is a dedicated IP, 

(I used a shared IP when I started getting these errors)

thanks for your help,

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