Used to work flawlessly before upgrade to 200.5.x, with the same config.
After APs boot up, all starts off great. After a period of time (sometimes as short as an hour or so), stations connected to the MAP start experiencing packet loss / transmission delays. If MAP is power-cycled, problem clears - clients are happy, until they are not again.
When the issue is present, RAP-MAP speed test doesn't show up any significant slow-down - it's around 400-450Mbps, just as when all is OK.
Channels are stable - I don't see any movements, even after MAP reboot, it comes up to occupy the same channels as before. There is no significant interference. 2.4 uses Background Scanning, 5 uses ChannelFly.
Was hoping that upgrading to 188.8.131.52.291 would help, but no, it didn't.