NOT VERY SURE....but I'm suspecting ViCar, sometimes when i make a call i cannot hear anything and if i do hear something the phone puts itself on-hold like every 3mins or thereabout. I've flashed my device (even the eMMC) and installed only ViCar and Timed Silencer, Rootsh (the only three stuff installed on my device the device) and i'm still having the same problem. It seems when i select only "Routing Enabled" without selecting "Call Directly on Default" it doesn't happen. I will continue to investigate and update you guys.