Despite the previous response, I am convinced of the connection between number of WGT friends and frequency of meter glitches. There was a forum thread a few months ago on this subject --> http://www.wgt.com/forums/t/50481.aspx
My friends list had grown over the last year and a half to over 150. Because the game window has a link to all your friends signed on to WGT and updates with each friend log-on and status change, these activities inject a pulse of 'noise' into the game window. If the change happens to occur during your down-stroke while the meter is running, it will glitch.
As a result of the discussion referred to, I reluctantly 'killed off' all my friends except fellow members of my club - <10 friends. Meter glitches were not totally eliminated but they were reduced by 80% - 90%!
What REALLY convinced me to go through this difficult process were reports that some of WGT top players regularly reduced their WGT friends to ZERO in preparation for participating in the Virtual Open tournaments.