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based on your other post, it might be a proximity sensor acting up
http://talk.sonymobile.com/t5/Xperia-Z2/When-on-a-call-screen-touches-by-ear/m-p/1130539
settings > about phone > diagnostics > test > test the proximity sensor
does your phone has a protective case, film or glass?
@CameronT thanks for your comments. I will surely keep that in mind but i pray it dont occur again, it was scary .Omg thanks again!!!