"Unknown Error"

When uploading, at times there is a long pause of inactivity. Sometimes the upload resumes. Sometimes I get an "Unknown Error" message and am disconnected.

When the upload is actually going, I get good speed, more or less maxing out my connection.

I have improved the situation by swtiching from Private Data Connection to Clear Data Connection, by increasing the Server Timout to 1500 seconds, and lowering the Retry to 3 seconds.

Though the problem is less frequent, it is still frequent enough to be annoying, especially when I put on a large download and then leave the house, only to find upon my return that the upload only lasted for five or ten minutes.

Any ideas?
Thanks for your help.