lg g4 stays on 3g when in wifi covered - G4 Q&A, Help & Troubleshooting

hello. this is a problem that i don't understand in a great phone like this: if i am in 3g connection and return over wifi covered room, upon i unlock screen, the connection stays in 3g or 4g..... but every other phone, even if phone is locked, when i return home, change connection to wifi!!! so, if i return over wifi and i don't unlock phone i stay for hours in 3g!!!!!
i set wifi every even standby.....
is this a permanent bug????
thanks

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