I can't use that mouse. I literally skip every time I turn a 180 due to hitting the malfunction speed.
Which generation G5 were you using?
Also, there may have been something electrically wrong with the one you used as mine has never done what you are describing. Back in my counter strike - source days I played what most people would call semi-pro with this mouse and managed to rank top 5% fairly consistently in anything fast-twitch. Sort of seems to me like I would have experienced this issue myself if it were present on all of the G5 devices (I've had three of them, two 1st gens and one 2nd gen).
Then again it could be some sort of hardware incompatibility issue. It wouldn't be the first time that assorted hardware decided for some unknown reason not to play nice with the rest of the PC.