Wifi signal with bluetooth

It seems like whenever I use my bluetooth while on a call with someone and when I try to browse the internet at the same time my wifi signal drops. I then put it on speaker phone for example and it regains the signal and everything works fine. I have tried two different bluetooth headsets and the same issue still happens, anyone know whats up? I tried different wireless channels on my router and I have also tried restoring my phone, still a no go.