Why will bluetooth and WiFi only work in close range to transmitters?

Hi,

After taking the back off my Moto G XT1032 recently, I have found that the WiFi and bluetooth now only work in very close proximity to the transmitter they're trying to connect to (bluetooth must be immediately next to whatever it's paired with, WiFi must be within 20cm or so). I suspect I have nudged something on an antenna somewhere but I can't for the life of me find out where it is to see if a connection is loose or something similar.

Does anyone know the fix to this problem, or even where the bluetooth/WiFi antenna is on Moto G XT1032?

Thanks