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I was seeing a similar issue on our Cisco 5508 using code version 184.108.40.206. In my case I was only seeing our 3802 APs go down (our 3702s were not affected). In our case we were getting hit by bug CSCvc40470 . After upgrading our WLC to code version 220.127.116.11 the problem ceased.
We're predominantly using 2702. I'll check into that bug report. Thanks for the info!
Edit: It looks like that bug only affects the 3800s, at least as listed. We may try installing the newer code on our backup controller and rolling some APs over to it and see if the problem replicates or goes away.