Click on this link to access your DNAS status page. http://188.8.131.52:8020/
Click on "Admin Login" at the upper right corner. (User name is "admin", all lower case, and the password is probably the same as the one you use to connect to it to broadcast)
Then click on "view logfile" at the top.
Copy and paste part of it in a post. If it's ten miles long, we don't need the whole thing... just an excerpt from it. (like any parts that look like errors)
Also, you NEED to find out your UPLOAD speed. Go here http://www.dslreports.com
. (The link earlier didn't work for you because they forgot the "s" at the end.) Go to Tests+Tools and then Speed Tests. When running the test, make sure you aren't doing anything else.