Lenovo — Lenovo k3 note - touch is becoming unresponsive often

Address:	Chennai, Tamil Nadu, 603001
Website:	Lenovo.com

I purchased Lenovo k3 note thorough flash sale on 2nd Sep, 2015 .The touch screen becomes unresponsive very often. few months later my sister bought the same phone again and even she is facing the same issue. This is very bad and a kind of cheat Lenovo has done to its customers and a serious action needs to be taken on this,

IMEI number (slot 1) - [protected]
IMEI SV (slot 1) - 78

IMEI number (slot 2) - [protected]
IMEI SV (slot 2) - 78

Model number - k50a40
Processor - MT6752 (8CORE 1.7 Ghz)