[tor-relays] Guard flag flapping

[Green Dream]

I have two relays on the same Gb/s connection. I followed the optimization
tips offered in another thread, and think I have things running reasonably
well. What I don't understand is why the Guard flag keeps flapping back and
forth on both relays.

https://atlas.torproject.org/#details/89B9AE4C778DE44AFFAB791093E19979616E69C4

https://atlas.torproject.org/#details/11A579CC6CEE644A390704977B70CBA8D8347783

If you look at the 1 week graph of weights, you'll see what I mean.

I haven't been able to find any documentation or explanation for this
behavior. Anyone have any thoughts on why this might be happening, or any
pointers on how to further investigate?
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