Same issue with multiple devices. Latest gen and second to recent gen iPhone and iPad pro. Lenovo X1 gen7 with win10 and latest intel WiFi drivers. MacBook Pro (2017/2018 models). Performance drops to 5-9mbps from any test source (iperf, speed test varying places). When you associate back with AP you came from speed is as expected (200-450mbps). AP bridging mode - clients part of same L2 vlan.
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