Default Bluetooth problem

Is anyone else having crap bluetooth connection with GS4? Signal is crap in that it easily cuts out, on my Note 2 and S3, they are strong and fantastic. I am using x2 types of bluetooth speakers with similar results.
1. Note 2 Palm Touchstone Wireless Charging Mod {Origami} - http://forum.xda-developers.com/show....php?t=1986016
2. Note 2 Powermat Wireless Charging Mod http://forum.xda-developers.com/show....php?t=2158978
3. S3 Palm Touchstone Wireless Charging Mod - http://forum.xda-developers.com/show....php?t=2134533

Free N7105 N7100 UNLOCK - http://forum.xda-developers.com/show....php?t=2014982