What have you done to troubleshoot the problem?

Which operating system are you using?

Has this just recently started or has the problem occurred for quite a while?

In the meantime, I would start by installing all the most recent drivers/firmware for your card and router.

http://www.giga-byte.com/Communication/Support/Driver/Driver_List.htm

In addition, because interruptions of that sort can be caused by other program and spyware conflicts, please try the steps in the links below:

First, download, install, update, then run the free spyware removal tools from the links below:

Ad-Aware">http://www.lavasoftusa.com/support/download/]Ad-Aware