tedster - 10:42 pm on Dec 17, 2010 (gmt 0)
I have always thought Google has been diverting my traffic somehow, messing with it.
The first thing I would check is your DNS settings - use one of the online tests. You may be a long term victim of DNS Cache Poisoning [webmasterworld.com]. Testing your DNS will tell you about any vulnerabilities you have.
Also, GWT = "Google Webmaster Tools"