export problem in magento 1.9

when i try to export my data from system>import/export>export when i select the product option and press on continue its start processing and after 120 sec it’s show a error page that 500-internal server error when i contact to my hosting provider they told me that its not there side error anyone can help me according this issue.it is a timeout problem but it start suddenly can anyone help me according to this problem that how to solve it. advance thanks