As a civilian, it's probably hard to know if the radar detection is a false positive or a true positive, but this does show that the devices are operating as they should from a regulatory perspective and that the difference in location is indeed responsible for the behavior you were seeing. Although not always ideal from a utlization standpoint (depending on your neighbors/environment), the solution is really to use non-DFS channels. That should resolve the problem and keep your APs up and running without periodic interruptions.
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Thanks! 