problem with the magnetometer

Hi , i plug the magnetometer face down as instructed but when we start to arducopter and arm the motors , giving throttle is totally unsafe . The quad start to oviliate like a coin on a table.Is it because it is configured to work at higher hight than take off ?Or do i have a problem .Also i can not pass to different modes with the exceed rc 6channel tx.Anyone kbow how to figure those two problems out.?

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