Definitely, some of the early firmware damaged the access point, which created problems with the 5 GHz network (delays, low speed, ping). I have problems with 6 APs. In addition, it became impossible for me to work with AirPrint printers (Canon, HP connected to a separate wireless network in the 2.4Ghz range on the same APs with no isolated) if the client is connected to a 5 Ghz network - the printers are simply not located, printer restart helps, but after some time printer again lost from AirPrint. Therefore, I had to disconnect the 5Ghz network and work at lower speeds at 2.4Ghz where everything works as it should. But it's crazy to spend a lot of money to face such problems ...I'm already thinking about selling my wireless points. Can someone recommend specific APs brand with seamless roaming to replace R710 and R610?