I had issues with my HMOL server yesterday. 4 APs were having slow CAPWAP (2 showing connected, but weren't really if you SSH'ed into them and 2 others showing offline when they weren't). This is why cloud managed vs cloud controlled is so important. Aerohive has a great cloud service, but nothing is 100%. My WiFi network isn't an add on or a bonus to my users. WiFi IS the network. Cloud controlled isn't just a bad idea because of a flaky WAN, but also because it is just adding another potential point of failure.