Logs and additional info @ 
https://wmatrix.googleplex.com/failures/wifi_matfunc?tests=network_WiFi_SimpleConnect.wifi_checkWPA2_CCMP_PMF&days_back=10&releases=tot&platforms=celes,reks,terra,lars,gandof,cyan

here is an example of the failure,

03/20 14:14:03.840 WARNI|              test:0602| Autotest caught exception when running test:
Traceback (most recent call last):
  File "/usr/local/autotest/client/common_lib/test.py", line 596, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 800, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 457, in execute
    dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 343, in _call_run_once_with_retry
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 372, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/server/site_tests/network_WiFi_SimpleConnect/network_WiFi_SimpleConnect.py", line 36, in run_once
    self.context.configure(router_conf)
  File "/usr/local/autotest/server/cros/network/wifi_test_context_manager.py", line 164, in configure
    multi_interface=multi_interface)
  File "/usr/local/autotest/server/site_linux_router.py", line 436, in hostap_configure
    self.start_hostapd(configuration)
  File "/usr/local/autotest/server/site_linux_router.py", line 307, in start_hostapd
    raise error.TestFail('hostapd failed to initialize AP '