If you are on a call, how could you use your wi-fi at the same time ?? Sounds perfectly normal to me.
Just today I got my LG 880 4X
But the same problem I had with my Xperia mini pro. I cant use wifi when I call someone. Before, and after the conversation is ended, the wifi works fine. I can use the wifi while Im calling when I am at work, so it seems its a problem with my router or something like that. Any hints?