Hi!
I own a Ventus Z mice, with the Avago sensor, pretty nice sensor it feels like an optical in all regards, I have the mouse for 6 months as my main for gaming.
However, days a go, while I was in a middle of a game the sensor stop working, wasn't responding and stuck in a jitter. I didn't know what happen, so I unplugged and plug back in, the problem keeps happening, so I tap around the sensor lens (no directly) and start to work again.
I play at 3900 dpi, but very low ingame sensitivity so I pick up the mouse from the pad quite often. After this incident, happen again and fix it