Unhappy [Q] Help my bluetooth signal is soo weak

I don't know what happen, but I have noticed the last couple of weeks my Bluetooth signal has gotten really week. I cant be more than 5 feet away from my jawbone jambox and my head set will not work if I put my phone in my pocket. I am really confused on what would cause this. I opened the back and cleaned everything just in case. Can someone please help me?