Scrolling wheel started to act wierd after aproximatly 2 years of usage. When I looked into problem I found that it is common problem on A4Tech X7 X-760H mouse and there is russian video how to fix this issue: https://www.youtube.com/watch?v=qYnvnLyzsMQ. I've aslo noted that scrolling wheel problem is very common in some other more expensive mouses from different companies.
Optical sensor is sensitive to dust - moving of mouse started to be erratic afther prolonged use. Cleaning by cotton swab and 60% EtOH helped to resolve issue. Mouse needs to have “mouse foot” (small plastic parts which comes into contact with surface and usually they're easily get lost), otherwise it just not detect surface properly.