What steps will reproduce the problem?
(1) Run  bluetooth_AdapterLEAdvertising.single 

What is the expected result?
Test passes

What happens instead?
On some devices the test fails with 
test_reset_advertising ({'advertising_disabled': True, 'reset_advertising_intervals': False, 'advertisement_removed': True})]

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I was able to reproduce the failure on a samus device. The test looks for the string "Reset Advertising Intervals." in btmon logs. When this failure occurs btmon logs doesn't have a log line with "Reset Advertising Intervals." but the log line is present in /var/log/messages.