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Purchased a RE580D exactly 7 days ago to extend my Archer D9 5Ghz Wifi. The extender unit worked like a charm for 2 days before dropping the 5Ghz Host connection. So rebooted the unit, however still would not connect as 5 Ghz host. Did full Factory reset, still would not connect as 5 Ghz host. So tried update of firmware to see if the fixed the situation, but no go. Found that unit would only Host on 2.4Ghz network. So returned it to store of purchase who replaced it with another RE580D brand new unit. Ok so setup this up as Host on 5Ghz and all worked well for 4 days then the exact same issue has occurred, dropped the capability to Host on 5Ghz band and this unit also dropped the ability to TX on 5 Ghz as well, unit will only Host and TX 2.4Ghz. There appears to be some serious flaws in the design of these units in which the 5 Ghz part fails and cannot be recovered via factory reset. Very very disappointed with this product and not wasting more money or time explaining the store where I purchased as they seem treat issue as customer's fault. :(

Will go buy another brand to the job.