We use another firewall solution and it happens just as frequently with some sites getting caught up in our malware filter. The initial bad sites lists are originally crowdsourced, I believe.

I've used Meraki, Aruba, Ruckus, and Cisco Aironet and have had no problems with any of them. They all have a duty cycle and radios don't last indefinitely. Usually what I find is someone brings in an old Linksys G-band AP and that squelches an area, the older radios are a lot noisier.