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On carrier test the easier way to understatnd it is look at the leftgraph with percent value, digits on the bottom represent the frequency for exapmle 12 represents 2412 and 17 represents 2417 and so on down to 2467. Percentage shown is the noisiest...
Do you have another workgroup bridge wired one the same lan segment as you Bridge in AP mode?Try disconnecting the brdige in AP mode from ethernet and see if you will stillget disconnectedI had a case very simular to this and that solved the issue.