Hi Rod,
Sites utilizing 5ghz should have a Site Survey performed for optimal coverage based on data requirements. This is imperative.
With that said, DFS channels should be removed as available channels to avoid client disruption.
Suggested 5ghz channel list for US country code with DFS (UNII2) channels removed.
channel-list 5GHz 36,40,44,48,149,153,157,161,165