Problem with Arduino receiving data from Wiimote!!

Hello! I have found a library from https://github.com/felis/USB_Host_Shield_2.0/blob/master/Wii.cpp

I am using this library to connect Arduino with Wiimote, I need to receive the data from wii motion.

The performances of pitch and roll are normal, but the yaw will drift a lot. It is very unstable.

Could anyone help me to solve this problem?