https://stainless.corp.google.com/search?view=list&first_date=2018-10-05&last_date=2018-11-01&test=%5Epower_AudioDetector%24&status=FAIL&status=ERROR&status=ABORT&reason=System+suspended+while+audio+was+playing.&exclude_cts=true&exclude_not_run=false&exclude_non_release=true&exclude_au=true&exclude_acts=true&exclude_retried=true&exclude_non_production=false

Failure message, 'System suspended while audio was playing', occurs 100's of times over the last 30 days on virtually every platform.

First instance of the failure appears to be R70-10962.0.0 (2018-08-12) so it does seem to be a regression / test flake starting there as previously message didn't occur.

crosland looks innocent though,

https://crosland.corp.google.com/log/10961.0.0..10962.0.0

Test also hasn't been touched in many years so not sure the change was introduced there.