I suffered from radar detections after upgrade from legacy wireless to wifi(wave2) and it looked like I could make them go away by moving the control channel.
I ended up moving to a completely different channel, so I cannot provide long-term experience, but it appeared like switching from e.g. channel 116 Ceee to channel 128 eeeC would prevent faulty radar detections although it covers the same frequency range. Might be worth a try.