Downstream VOIP RTP Packet Loss (MR42/MR42E/MR52/MR53/MR53E/MR84)
This has been broken for at least 18+ months. It makes Facetime calls absolutely unusable. The only workaround it to reset all DSCP values on the switch side to (presumably) prevent the traffic from landing in whatever queue on the AP is jacked up.
27.4 is now a stable release candidate! Well deserved IMO, the 27.3 and 27.4 releases have both been rock solid. Really a no brainer for WiFi 6 APs but even on my MR53 the performance has been more consistent.