touch pad lagging Lenovo Z50-70

Feb 5, 2019
It's been few days that Whenever I use my Lenovo Z50-70 while plugged in charging my touchpad starts lagging and causes delays to my work...?
kindly suggest if I should check for any hardware issue or internal settings.

recently I did a new windows 10 to it and couldn't find the right drivers for touchpad so it was idle for about a month(was using external mouse) now my brother had run a driver pack in it and the issue was resolved...