Well, what can I say, fails for me in this scenario. Maybe the NICs on the other end matter too, but I experienced same issues on 4 different desktops with both

Well, what can I say, fails for me in this scenario. Maybe the NICs on the other end matter too, but I experienced same issues on 4 different desktops with both 2.5gbit Realteks and 10gbit AQtions. All the Flex swithes I tried glitched: USW-Flex-Mini, USW-Flex-2.5G-5 (frame drops and interface going down for several seconds) and (to lesser extent, just frame drops) USW-Flex. Have no idea why but I observed that more under UDP loads.