https://wmatrix.googleplex.com/failures/wifi_matfunc?platforms=daisy&tests=network_WiFi_Roam.wifi_roamWPA&days_back=25&releases=53,52

Sample failure:
Traceback (most recent call last):
  File "/usr/local/autotest/client/common_lib/test.py", line 600, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 804, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 461, in execute
    dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 347, in _call_run_once_with_retry
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 376, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/server/site_tests/network_WiFi_Roam/network_WiFi_Roam.py", line 50, in run_once
    self._router1_conf.frequency)
  File "/usr/local/autotest/server/cros/network/wifi_test_context_manager.py", line 340, in wait_for_connection
    ping_ip=wifi_ip, desired_subnet=desired_subnet)
  File "/usr/local/autotest/server/cros/network/wifi_client.py", line 1094, in wait_for_connection
    (ssid, freq_error_str, duration(), state))
TestFail: Failed to connect to "Roam_a_lugsw_ch1" on frequency 5240 Mhz in 31.192949 seconds (state=idle)