If you want a good mouse that doesn't do this: Kone Pure or G303. The DM1 Pro S and Nixeus Revel are also really good.
My G403 uses a mechanical encoder but at least it didn't jump because it has distinctive notches. My DeathAdders have never done so either. But guess what? My EC2-A and FK1 did. I've stayed away from Zowie as much as possible since then.
I can remember Zowie trying to "fix" it by putting their 12-step scroll wheels back into their mice instead of the 24 step ones. Yeah... that worked well, didn't it.