Hello guys I have a Vivo Y51L and I have a complaint about it that is to be discussed here the problem is that in this phone when I switch to a 3G networl like Vodafone 3G or Airtel 3G this phones goes off and when it turns on it automatically selects to a 2G mode again I select thd 3G mode and thd moment I tap on network bar phone goes off and the same process is happening with me from the last 1 months I am now very much irritated to use a Vivo phones.