It already happened that at work they bought 3 router data for installation on a robot and all turned out to be A3 revisions. 5 GHz works every other time and is very bad. One of the routers stopped turning on 5 GHz after a week. 2.4 still somehow works, but with periodic delays up to 0.5s. But the funniest thing happens when you connect a lidar to the lan port, which constantly sends 100 MB UDP packets. The router will instantly turn off 5 GHz until you turn off the lidar. The younger model RT-AC66U has no such problems. As, perhaps, with other hardware revisions of this model. Check the hardware revision immediately in the store so as not to suffer. I would have handed over all three under warranty, but two of them cut off the power wire in order to power the robot from the battery.
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