why Internet is getting down?

Hi all,

we are using a satellite connection for an internet cafe of 40 computers. The problem is we had less customers before & all was working fine, Now what happens is when any of the customer opens youtube it starts giving request time out. I m pinging it continuously. why it is happening while we were using youtube beofore we never had problem with it. Could you please help me figure out why it is happening>>>???

Thanks alot