net_unittests on Android failing on chromium.android/Android N5X Swarm Builder

Type: build-failure

Builders failed on: 
- Android N5X Swarm Builder: 
  https://build.chromium.org/p/chromium.android/builders/Android%20N5X%20Swarm%20Builder

About 10% of the last 100 runs have failed with "crashed or hung". It seems to suddenly lose its connection with the device, e.g. from the stdio for the tests:

I  194.237s tear_down_device(00b924f3259e9ecf)  Wrote device cache: /b/swarm_slave/w/irYckGmb/out/Release/device_cache_00b924f3259e9ecf.json
I  194.238s tear_down_device(00c6855bac6f208d)  Wrote device cache: /b/swarm_slave/w/irYckGmb/out/Release/device_cache_00c6855bac6f208d.json
I  194.239s tear_down_device(00b9305f8f974228)  Wrote device cache: /b/swarm_slave/w/irYckGmb/out/Release/device_cache_00b9305f8f974228.json
E  207.254s Main  Unrecognized error occurred.