What device model do you have again and carrier are you on again. I'm being to think that is the issue as TexasLTE is on sprint and has been a tester for me since I started this thread and he is not having any WiFi and data issues at all.
As for 6.4.1 I will release it today it has a couple of fixes in it .
Sent from my SAMSUNG-SGH-I747 using Tapatalk
Can't wait
Sent from my SPH-L710 using xda app-developers app