wifi and bluetooth weak signals

I have been experiencing bad wifi and bluetooth reception, i have to be right next to the router to get full bars and wifi calling. As for bluetooth, in my car i have to hold up the phone to the radio pretty much or it'll cut out. On top of that, the GPS is really inaccurate.

I have an idea its the wifi/bluetooth/gps chip in the phone.

My question is: Has anyone had this problem and fixed it by replacing the wifi chip?

or If anyone has any other suggestions please, I'm all ears

thanks

Oh yeah i have tried restoring, deleting everything off the phone and starting fresh, to no avail. I have tried replacing the actual back of the case, the part that the logic board is attached to, and has the antennas in, but this just gave me a weaker signal, and my cellular service was worse so i went back to the original case.