I have flashed stock 5.1.1 COK3 on my N910W8 with smart switch and i am getting bad signal. Mind you before i used smart switch i downgraded and upgraded alot on 5.0.1 and 4.4.4 and 5.1.1. I am now on stock 5.1.1 and i am getting between -95 dbm to -120dm. my moms galaxy s6 on same network is getting -84 dbm. My apn is ok, What could this be?