Intermittent compilation interruption on windows

[jdm]

   Compiling profile_tests v0.0.1 (C:\Users\task_1578926820\repo\tests\unit\profile)
   Compiling gfx v0.0.1 (C:\Users\task_1578926820\repo\components\gfx)
   Compiling servo_config v0.0.1 (C:\Users\task_1578926820\repo\components\config)
   Compiling net_traits v0.0.1 (C:\Users\task_1578926820\repo\components\net_traits)
   Compiling style_tests v0.0.1 (C:\Users\task_1578926820\repo\tests\unit\style)
   Compiling net v0.0.1 (C:\Users\task_1578926820\repo\components\net)
   Compiling metrics_tests v0.0.1 (C:\Users\task_1578926820\repo\tests\unit\metrics)
   Compiling layout_2013 v0.0.1 (C:\Users\task_1578926820\repo\components\layout)
   Compiling mozjs v0.12.1 (https://github.com/servo/rust-mozjs#9b0d063b)
   Compiling script_tests v0.0.1 (C:\Users\task_1578926820\repo\tests\unit\script)
[taskcluster 2020-01-13T18:07:42.697Z]    Exit Code: 1073807364
[taskcluster 2020-01-13T18:07:42.697Z]    User Time: 46.875ms
[taskcluster 2020-01-13T18:07:42.697Z]  Kernel Time: 125ms
[taskcluster 2020-01-13T18:07:42.697Z]    Wall Time: 3m31.6374339s
[taskcluster 2020-01-13T18:07:42.697Z]       Result: FAILED
[taskcluster 2020-01-13T18:07:42.697Z] === Task Finished ===
[taskcluster 2020-01-13T18:07:42.697Z] Task Duration: 37m14.867273s

The build just sometimes stops with no clear reason. This is after the main build finished ~28 minutes, and it was in the middle of building for test-unit.