ACS problem in some scenarios

When a group of AP is rebooted at the same time (which is very common after a power outage) it is very likely that some of them end in the same frequency, causing self interference.

That's correct. It is not recommended to have ACS enabled on colocated APs for this reason. It is a tool that you can use to pick the best channel when you are actively managing them. But you should not have ACS always enabled by default when you have colocated APs. 



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