I found another weird problem. when i put my phone on Table or something It completely stop giving touch response but when i put back on my hand it gives touch response. When i remove my hand behind from back of phone it again stop touch (While holding my phone with two finger from side, Like while Taking picture) and when i put back my hand behind phone it again start working touch.
I tested it on Stock rom, CM11 and also another XperiaZ mod rom. so please don't say me that i have problem in ROM.