In most cases it is been observed that people do use DSO with DFS or DSO with iDFS. Where they think that the link will fight against noise now,and their job is done. But that is actually not true where your Master side has "No noise or Lowe noise" But but but......The slave side has "high noise" on current channel which is been recommended by Master.
So in such scenarios the link will flap or may be this one sided noise would create performance issues. This same can be cross verified on Link Planner (click here to download).
So in order to mitigate such one sided noise issues. Please enable Asymetric DSO under Spectrum Expert-->Enable Asymetric DSO. This will liberate Slave radio to move any channel which is clean irrespective to Master's recommended channel. I can guarantee you that this will resolve the Slave end noise issue for sure.
Hope this will help rectifying such odd issues.
Regards,
Deepesh Chandra Sharma.
Technical Specialist-L3 Networks.
Cisco Certified Network Professional.
Cambium Certified over PMP/PTP/ePMP.