Odd Yaw Problem

i just bought a Holybro 6c Mini and am running Arducopter firmware so I can use the antenna tracker I built. (that’s a whole nuther story). This is the first time I’ve actually set up a flight controller with Arducopter programming. Not as easy as it sounds. Actually. it tuned up nicely and I like the way it acts and feels. The only problem is in the Yaw. Every few seconds the copter will yaw slightly to one side or the other and return to center. I don’t know what could cause this so I don’t know what can fix this. Any suggestions?

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Magfit utility

Really?

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Yeah. Really. I’ve been using PX4 and QGC for a few years. It’s a simpler program with fewer options to deal with. However, with the right tweaking, Arducopter works great. Especially since there is an Antenna Tracker available. Just the one little yaw problem I can’t seem to get rid of