Hello, did you say you tried to redownload the miniclient? Does this also occur if you play on browser? If so, I would suggest flushing your DNA as well, and please let me know if you are still experiencing issues.

Rinzler made a nice post that should be able to help you out, it is a tutorial on as to how to change DNS servers, which I only recommend if flushing does not help out. I will post the flush dns tutorial first.

Flush DNS

Change DNS Server