Yes, little hairs or fluffs coming into the little optical hole will cause that behaviour, so regularly clean/dust your mousing surface and mouse's surface. Btw, I used to have the A4tech X7 going up to 2500 dpi, and thought I was upgrading it when I
got the G5, which was a lot more expensive than the A4tech.
Boy, was I wrong! I soon started pining for my A4tech again, which had 5 dpi settings, instead if the G5's 3. Also, the G5 only goes to 2000dpi and is a clumsy bugger with a thick, clumsy chord.
As my old X7 was a bit worn out, I checked my friendly local hardware store, and just this morning, I installed my brand-new X7 XL-750BK.
This baby sports 16k programmable on-board memory, full-speed USB, and 6 dpi settings (one button for 6 settings - on the fly) as opposed to the G5 miserly 3 settings only up to 2000dpi; and I got the X7 at a fraction of the G5's price. :lol: And my new X7 goes up to 3600dpi!
Um, still trying to get used to that, actually...
The only thing that isn't quite as nice on the X7, is that the G5 has a bigger teflon foot, but I'll just go buy one seperately; - and then we're back in business with a vengeance.... DOW, here I come!
Of course, the Razor Lachesis is theoretically a better mouse, but for the price it retails at, I think I could forego not having to try to get used to 4000dpi....